Chemistry (School & UG)
Q. What is the major product of the elimination reaction of 2-bromobutane with a strong base?
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A.
Butene
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B.
2-butene
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C.
1-butene
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D.
Butyne
Solution
The major product of the elimination of 2-bromobutane with a strong base is butene, specifically 2-butene due to the more stable alkene formation.
Correct Answer: B — 2-butene
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Q. What is the major product of the following reaction: CH3Br + NaOH (ethanol)?
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A.
CH3OH
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B.
CH3O-Na+
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C.
CH3-NaBr
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D.
CH3-CH2-OH
Solution
The reaction is an SN2 substitution where the nucleophile (OH-) attacks the carbon bonded to Br, resulting in the formation of CH3OH.
Correct Answer: A — CH3OH
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Q. What is the major product of the hydration of propene in the presence of sulfuric acid?
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A.
Propan-1-ol
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B.
Propan-2-ol
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C.
Propanoic acid
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D.
Propyl sulfate
Solution
The major product of the hydration of propene is propan-2-ol due to Markovnikov's rule.
Correct Answer: B — Propan-2-ol
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Q. What is the major product of the reaction between 1-bromopropane and sodium hydroxide in an aqueous solution?
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A.
1-Propanol
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B.
2-Propanol
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C.
Propene
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D.
No reaction
Solution
The reaction is a nucleophilic substitution (SN2) where sodium hydroxide replaces the bromine atom, resulting in 1-Propanol.
Correct Answer: A — 1-Propanol
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Q. What is the major product of the reaction between 1-bromopropane and sodium hydroxide in ethanol?
-
A.
Propene
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B.
1-Propanol
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C.
2-Propanol
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D.
No reaction
Solution
The major product is 1-Propanol, as the reaction proceeds via an SN2 mechanism leading to the formation of an alcohol.
Correct Answer: B — 1-Propanol
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Q. What is the major product of the reaction between 1-butene and H2 in the presence of a catalyst?
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A.
1-butene
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B.
2-butene
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C.
Butane
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D.
Cyclobutane
Solution
The hydrogenation of 1-butene leads to the formation of butane as the major product.
Correct Answer: C — Butane
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Q. What is the major product of the reaction between 1-butene and HBr?
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A.
1-bromobutane
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B.
2-bromobutane
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C.
3-bromobutane
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D.
butane
Solution
The reaction follows Markovnikov's rule, where HBr adds across the double bond, leading to the formation of 2-bromobutane as the major product.
Correct Answer: B — 2-bromobutane
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Q. What is the major product of the reaction between 1-butyne and H2 in the presence of a catalyst?
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A.
Butane
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B.
Butene
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C.
Cyclobutane
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D.
1-Butyne
Solution
The hydrogenation of 1-butyne in the presence of a catalyst produces butane as the major product.
Correct Answer: A — Butane
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Q. What is the major product of the reaction between 1-butyne and HBr?
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A.
1-bromobutane
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B.
2-bromobutane
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C.
butane
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D.
bromobenzene
Solution
The addition of HBr to 1-butyne follows Markovnikov's rule, leading to the formation of 2-bromobutane.
Correct Answer: B — 2-bromobutane
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Q. What is the major product of the reaction between 2-bromobutane and potassium tert-butoxide?
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A.
2-butene
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B.
1-butene
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C.
tert-butyl bromide
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D.
butane
Solution
The major product is 2-butene, as potassium tert-butoxide promotes elimination (E2) leading to the formation of an alkene.
Correct Answer: A — 2-butene
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Q. What is the major product of the reaction between propene and bromine?
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A.
1-bromopropane
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B.
2-bromopropane
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C.
1,2-dibromopropane
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D.
No reaction
Solution
The reaction of propene with bromine results in the formation of 1,2-dibromopropane through an addition reaction.
Correct Answer: C — 1,2-dibromopropane
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Q. What is the major product of the reaction between propene and HBr?
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A.
1-bromopropane
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B.
2-bromopropane
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C.
Bromopropane mixture
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D.
No reaction
Solution
The major product is 2-bromopropane due to Markovnikov's rule, where H adds to the less substituted carbon.
Correct Answer: B — 2-bromopropane
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Q. What is the major product of the reaction of 1-bromo-2-methylpropane with sodium hydroxide in ethanol?
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A.
1-methylpropene
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B.
2-methylpropene
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C.
2-bromopropane
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D.
1-bromopropane
Solution
The reaction is an elimination reaction (E2) leading to the formation of 2-methylpropene as the major product.
Correct Answer: B — 2-methylpropene
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Q. What is the major product of the reaction of 1-butyne with HBr?
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A.
1-bromobutane
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B.
2-bromobutane
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C.
butane
-
D.
bromobenzene
Solution
The reaction of 1-butyne with HBr follows Markovnikov's rule, leading to the formation of 2-bromobutane.
Correct Answer: B — 2-bromobutane
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Q. What is the major product of the reaction of 1-chloropropane with sodium hydroxide in an SN2 mechanism?
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A.
1-propanol
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B.
2-propanol
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C.
Propyl chloride
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D.
Sodium chloride
Solution
The reaction of 1-chloropropane with sodium hydroxide in an SN2 mechanism results in the formation of 1-propanol through nucleophilic substitution.
Correct Answer: A — 1-propanol
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Q. What is the major product of the reaction of 1-pentene with H2 in the presence of a palladium catalyst?
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A.
Pentane
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B.
1-pentanol
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C.
2-pentanol
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D.
Cyclopentane
Solution
The reaction is a hydrogenation that converts 1-pentene to pentane, a saturated hydrocarbon.
Correct Answer: A — Pentane
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Q. What is the major product of the reaction of 2-bromo-2-methylpropane with a strong base?
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A.
2-methylpropene
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B.
2-bromo-2-methylpropane
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C.
Isobutylene
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D.
No reaction
Solution
The strong base induces an E2 elimination reaction, leading to the formation of 2-methylpropene as the major product.
Correct Answer: A — 2-methylpropene
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Q. What is the major product of the reaction of 2-methyl-2-bromopropane with KOH?
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A.
2-methylpropene
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B.
2-bromopropene
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C.
2-methyl-2-propanol
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D.
No reaction
Solution
The reaction favors elimination due to the bulky substrate, leading to the formation of 2-methylpropene.
Correct Answer: A — 2-methylpropene
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Q. What is the major product of the reaction of 2-methylpropene with H2 in the presence of a platinum catalyst?
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A.
2-methylpropane
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B.
2-methylpropene
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C.
Cyclopropane
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D.
No reaction
Solution
The reaction of 2-methylpropene with H2 in the presence of a platinum catalyst results in the hydrogenation of the alkene to form 2-methylpropane.
Correct Answer: A — 2-methylpropane
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Q. What is the major product of the reaction of 2-methylpropene with HBr?
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A.
2-bromopropane
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B.
1-bromopropane
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C.
3-bromopropane
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D.
2-bromo-2-methylpropane
Solution
The major product is 2-bromopropane due to Markovnikov's rule, where the bromine adds to the more substituted carbon.
Correct Answer: A — 2-bromopropane
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Q. What is the major product of the reaction of 2-pentene with HBr?
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A.
1-bromopentane
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B.
2-bromopentane
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C.
3-bromopentane
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D.
bromopentane
Solution
The addition of HBr to 2-pentene follows Markovnikov's rule, leading to the formation of 2-bromopentane.
Correct Answer: B — 2-bromopentane
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Q. What is the major product of the reaction of benzene with bromine in the presence of FeBr3?
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A.
Bromobenzene
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B.
Benzyl bromide
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C.
Phenol
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D.
Benzene dibromide
Solution
The reaction is an electrophilic aromatic substitution, resulting in the formation of bromobenzene as the major product.
Correct Answer: A — Bromobenzene
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Q. What is the major product when 2-methylpropene reacts with H2 in the presence of a catalyst?
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A.
2-methylpropane
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B.
2-methylpropan-1-ol
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C.
Propane
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D.
2-methylpropan-2-ol
Solution
The hydrogenation of 2-methylpropene results in the saturation of the double bond, yielding 2-methylpropane as the major product.
Correct Answer: A — 2-methylpropane
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Q. What is the major product when 2-methylpropene reacts with H2O in the presence of an acid?
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A.
2-methylpropan-2-ol
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B.
2-methylpropan-1-ol
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C.
2-methylpropanoic acid
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D.
2-methylpropene
Solution
The major product is 2-methylpropan-2-ol due to Markovnikov's rule, where water adds to the more substituted carbon.
Correct Answer: A — 2-methylpropan-2-ol
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Q. What is the major product when anisole (methoxybenzene) undergoes nitration?
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A.
Nitroanisole (ortho)
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B.
Nitroanisole (para)
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C.
Dinitroanisole
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D.
Anisole
Solution
The major product is para-nitroanisole due to the electron-donating effect of the methoxy group, which directs the electrophile to the para position.
Correct Answer: B — Nitroanisole (para)
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Q. What is the major product when phenol is treated with bromine water?
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A.
Bromobenzene
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B.
2-bromophenol
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C.
4-bromophenol
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D.
Bromophenol
Solution
Phenol reacts with bromine water to predominantly form 2-bromophenol due to the activating effect of the hydroxyl group.
Correct Answer: C — 4-bromophenol
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Q. What is the maximum number of electrons that can occupy the 3d subshell?
Solution
The maximum number of electrons in a subshell is given by 2n^2. For d (n=3), it is 2(3^2) = 18, but only 10 can occupy 3d.
Correct Answer: C — 10
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Q. What is the maximum number of electrons that can occupy the n=2 energy level?
Solution
The maximum number of electrons in an energy level is given by the formula 2n^2. For n=2, it is 2(2^2) = 8.
Correct Answer: C — 8
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Q. What is the maximum number of stereoisomers for a compound with two chiral centers?
Solution
The maximum number of stereoisomers for a compound with n chiral centers is given by 2^n. For 2 chiral centers, it is 2^2 = 4.
Correct Answer: B — 4
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Q. What is the maximum number of unpaired electrons in a nitrogen atom?
Solution
Nitrogen has three unpaired electrons in its 2p orbitals (1s2 2s2 2p3).
Correct Answer: C — 3
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