Q. What is the main product when propanal is treated with excess Grignard reagent followed by hydrolysis?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propan-1,2-diol
-
D.
Butan-2-ol
Solution
The reaction of propanal with excess Grignard reagent followed by hydrolysis yields propan-2-ol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when propanal is treated with excess hydrogen in the presence of a catalyst?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propanoic acid
-
D.
Propane
Solution
Propanal is reduced to propan-1-ol when treated with excess hydrogen in the presence of a catalyst.
Correct Answer: A — Propan-1-ol
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Q. What is the main product when propanoic acid is treated with thionyl chloride?
-
A.
Propyl chloride
-
B.
Propanoic anhydride
-
C.
Propionyl chloride
-
D.
Propylene
Solution
The reaction of propanoic acid with thionyl chloride produces propionyl chloride.
Correct Answer: C — Propionyl chloride
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Q. What is the main product when propene is reacted with hydrogen in the presence of a catalyst?
-
A.
Propane
-
B.
Butane
-
C.
Ethane
-
D.
Cyclopropane
Solution
The main product of the hydrogenation of propene is propane.
Correct Answer: A — Propane
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Q. What is the main product when propene undergoes hydroboration-oxidation?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Propanoic acid
-
D.
Butanol
Solution
The main product of hydroboration-oxidation of propene is propan-2-ol.
Correct Answer: B — Propan-2-ol
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Q. What is the main product when toluene is nitrated?
-
A.
Nitrotoluene
-
B.
Dinitrotoluene
-
C.
Benzaldehyde
-
D.
Benzyl alcohol
Solution
Nitration of toluene primarily yields nitrotoluene, with the nitro group being directed to the ortho and para positions.
Correct Answer: A — Nitrotoluene
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Q. What is the main purpose of emulsifiers in food products?
-
A.
Thicken
-
B.
Stabilize mixtures
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C.
Add flavor
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D.
Preserve freshness
Solution
Emulsifiers stabilize mixtures of oil and water, preventing separation in food products.
Correct Answer: B — Stabilize mixtures
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Q. What is the main purpose of using antioxidants in food?
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A.
Enhance color
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B.
Prevent oxidation
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C.
Improve taste
-
D.
Increase shelf life
Solution
Antioxidants are used to prevent oxidation, which can lead to spoilage and loss of quality.
Correct Answer: B — Prevent oxidation
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Q. What is the main purpose of using baking soda in cooking?
-
A.
Flavoring
-
B.
Leavening
-
C.
Preserving
-
D.
Coloring
Solution
Baking soda acts as a leavening agent, helping baked goods to rise.
Correct Answer: B — Leavening
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Q. What is the main purpose of using fluoride in dental care?
-
A.
Whiten teeth
-
B.
Prevent cavities
-
C.
Freshen breath
-
D.
Strengthen gums
Solution
Fluoride is used in dental care to help prevent cavities and strengthen tooth enamel.
Correct Answer: B — Prevent cavities
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Q. What is the main reaction type when alcohols are converted to alkyl halides?
-
A.
Substitution
-
B.
Elimination
-
C.
Addition
-
D.
Redox
Solution
The conversion of alcohols to alkyl halides typically involves a nucleophilic substitution reaction.
Correct Answer: A — Substitution
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Q. What is the main reason for the existence of geometric isomers?
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A.
Presence of double bonds
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B.
Presence of single bonds
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C.
Presence of chiral centers
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D.
Presence of functional groups
Solution
Geometric isomers arise due to restricted rotation around double bonds.
Correct Answer: A — Presence of double bonds
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Q. What is the main reason for the stability of aromatic compounds?
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A.
High molecular weight
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B.
Presence of double bonds
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C.
Resonance energy
-
D.
Hydrogen bonding
Solution
The stability of aromatic compounds is primarily due to resonance energy, which arises from the delocalization of pi electrons across the ring.
Correct Answer: C — Resonance energy
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Q. What is the main reason for the stability of benzene?
-
A.
Presence of double bonds
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B.
Resonance
-
C.
Hydrogen bonding
-
D.
Ionic interactions
Solution
The stability of benzene arises from resonance, where the electrons are delocalized over the ring structure, lowering the overall energy.
Correct Answer: B — Resonance
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Q. What is the main source of alkanes?
-
A.
Coal
-
B.
Natural gas
-
C.
Petroleum
-
D.
Biomass
Solution
The main source of alkanes is petroleum, which contains a mixture of hydrocarbons.
Correct Answer: C — Petroleum
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Q. What is the main storage form of carbohydrates in animals?
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A.
Starch
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B.
Glycogen
-
C.
Cellulose
-
D.
Chitin
Solution
Glycogen is the main storage form of carbohydrates in animals, while starch is the storage form in plants.
Correct Answer: B — Glycogen
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Q. What is the main structural component of plant cell walls?
-
A.
Starch
-
B.
Glycogen
-
C.
Cellulose
-
D.
Chitin
Solution
Cellulose is the main structural component of plant cell walls.
Correct Answer: C — Cellulose
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Q. What is the main type of isomerism exhibited by butene (C4H8)?
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A.
Structural isomerism
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B.
Geometric isomerism
-
C.
Optical isomerism
-
D.
Functional isomerism
Solution
Butene exhibits geometric isomerism due to the presence of a double bond, allowing for cis and trans configurations.
Correct Answer: B — Geometric isomerism
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Q. What is the main type of reaction that alkanes undergo?
-
A.
Addition
-
B.
Substitution
-
C.
Elimination
-
D.
Condensation
Solution
Alkanes primarily undergo substitution reactions, especially in the presence of halogens.
Correct Answer: B — Substitution
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Q. What is the main use of polycarbonate?
-
A.
Insulation
-
B.
Optical lenses
-
C.
Textiles
-
D.
Adhesives
Solution
Polycarbonate is primarily used in the production of optical lenses due to its clarity and strength.
Correct Answer: B — Optical lenses
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Q. What is the main use of polyvinyl chloride (PVC)?
-
A.
Insulation
-
B.
Pipes and fittings
-
C.
Textiles
-
D.
Adhesives
Solution
Polyvinyl chloride (PVC) is primarily used in pipes and fittings due to its durability.
Correct Answer: B — Pipes and fittings
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Q. What is the major product of the hydration of propene?
-
A.
Propan-1-ol
-
B.
Propan-2-ol
-
C.
Butanol
-
D.
Ethylene glycol
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-bromo-2-methylpropane and sodium ethoxide?
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A.
1-ethoxy-2-methylpropane
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B.
2-ethoxy-2-methylpropane
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C.
1-bromo-2-ethoxypropane
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D.
2-bromo-2-methylpropane
Solution
The reaction is an SN2 reaction leading to the formation of 1-ethoxy-2-methylpropane.
Correct Answer: B — 2-ethoxy-2-methylpropane
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Q. What is the major product of the reaction between 1-bromobutane and sodium ethoxide in ethanol?
-
A.
1-ethoxybutane
-
B.
2-ethoxybutane
-
C.
butane
-
D.
no reaction
Solution
The reaction is an example of an SN2 reaction, where sodium ethoxide acts as a nucleophile, leading to the formation of 1-ethoxybutane.
Correct Answer: B — 2-ethoxybutane
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Q. What is the major product of the reaction between 1-bromobutane and sodium hydroxide in ethanol?
-
A.
1-butanol
-
B.
2-butanol
-
C.
butyl bromide
-
D.
butyl ether
Solution
The reaction leads to the formation of 1-butanol through an SN2 mechanism.
Correct Answer: B — 2-butanol
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Q. What is the major product of the reaction between chlorobenzene and sodium hydroxide at high temperature?
-
A.
Phenol
-
B.
Benzene
-
C.
Chlorobenzene
-
D.
Sodium phenoxide
Solution
The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic substitution.
Correct Answer: A — Phenol
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Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide in ethanol?
-
A.
1-butene
-
B.
2-butene
-
C.
butane
-
D.
no reaction
Solution
The reaction proceeds via an elimination mechanism (E2) leading to the formation of 2-butene as the major product.
Correct Answer: B — 2-butene
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Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide?
-
A.
Butane
-
B.
Ethyl butyl ether
-
C.
1-butene
-
D.
2-butene
Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.
Correct Answer: B — Ethyl butyl ether
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Q. What is the major product of the reaction of 1-butene with HBr?
-
A.
1-bromobutane
-
B.
2-bromobutane
-
C.
Butane
-
D.
Bromobenzene
Solution
The major product of the reaction of 1-butene with HBr is 2-bromobutane due to Markovnikov's rule.
Correct Answer: B — 2-bromobutane
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Q. What is the major product of the reaction of 2-butyne with H2 in the presence of a catalyst?
-
A.
1-butyne
-
B.
butane
-
C.
2-butyne
-
D.
3-butyne
Solution
The major product of hydrogenation of 2-butyne is butane.
Correct Answer: B — butane
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