Haloalkanes
Q. What is the expected major product when 2-bromobutane undergoes elimination reaction?
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A.
But-1-ene
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B.
But-2-ene
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C.
But-3-ene
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D.
Butane
Solution
The major product of the elimination reaction of 2-bromobutane is But-2-ene due to the formation of the more stable alkene.
Correct Answer: B — But-2-ene
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Q. What is the expected product of the reaction of 1-chlorobutane with zinc in dry ether?
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A.
Butane
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B.
Butyne
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C.
Butene
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D.
No reaction
Solution
The reaction of 1-chlorobutane with zinc in dry ether leads to the formation of Butane via Wurtz reaction.
Correct Answer: A — Butane
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Q. What is the expected product when 1-chlorobutane reacts with aqueous NaOH?
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A.
Butanol
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B.
Butene
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C.
No reaction
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D.
Butyric acid
Solution
The expected product is Butanol due to nucleophilic substitution with hydroxide ion.
Correct Answer: A — Butanol
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Q. What is the IUPAC name of CH3CH2Cl?
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A.
Chloroethane
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B.
Ethyl chloride
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C.
Ethane chloride
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D.
Chloromethane
Solution
The IUPAC name of CH3CH2Cl is Chloroethane, as it is a two-carbon alkane with a chlorine substituent.
Correct Answer: A — Chloroethane
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Q. What is the main type of reaction that haloalkanes undergo? (2020)
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A.
Addition
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B.
Substitution
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C.
Elimination
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D.
Redox
Solution
Haloalkanes primarily undergo nucleophilic substitution reactions due to the presence of a good leaving group (halogen).
Correct Answer: B — Substitution
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Q. What is the major product when 2-bromobutane is treated with KOH in ethanol?
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A.
But-1-ene
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B.
But-2-ene
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C.
Butane
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D.
No reaction
Solution
The major product is But-2-ene due to the more stable double bond formed during elimination.
Correct Answer: B — But-2-ene
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Q. What is the product of the reaction between 1-bromobutane and sodium hydroxide in ethanol? (2021)
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A.
Butanol
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B.
Butyl bromide
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C.
Butyl ether
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D.
Butyric acid
Solution
The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to the formation of butanol through nucleophilic substitution.
Correct Answer: A — Butanol
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Q. What is the product of the reaction between 1-bromopropane and sodium hydroxide in ethanol?
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A.
Propene
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B.
1-Propanol
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C.
2-Propanol
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D.
No reaction
Solution
1-bromopropane reacts with sodium hydroxide in ethanol to form 1-Propanol via nucleophilic substitution.
Correct Answer: B — 1-Propanol
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Q. What type of reaction occurs when haloalkanes react with aqueous KOH?
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A.
Nucleophilic substitution
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B.
Elimination
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C.
Addition
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D.
Redox
Solution
Haloalkanes react with aqueous KOH primarily through nucleophilic substitution to form alcohols.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when haloalkanes react with metals like magnesium?
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A.
Substitution
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B.
Elimination
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C.
Addition
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D.
Grignard formation
Solution
The reaction of haloalkanes with metals like magnesium leads to Grignard formation, which is a key step in organic synthesis.
Correct Answer: D — Grignard formation
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Q. What type of reaction occurs when haloalkanes react with metals like zinc?
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A.
Substitution
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B.
Elimination
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C.
Reduction
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D.
Oxidation
Solution
The reaction of haloalkanes with metals like zinc is a reduction reaction, forming alkanes.
Correct Answer: C — Reduction
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Q. What type of reaction occurs when haloalkanes react with nucleophiles? (2020)
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A.
Elimination
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B.
Substitution
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C.
Addition
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D.
Redox
Solution
Haloalkanes typically undergo nucleophilic substitution reactions where the halogen is replaced by a nucleophile.
Correct Answer: B — Substitution
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Q. Which haloalkane has the highest boiling point?
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A.
CH3Cl
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B.
C2H5Br
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C.
C3H7Cl
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D.
C4H9I
Solution
C4H9I has the highest boiling point due to the larger molecular size and stronger van der Waals forces.
Correct Answer: D — C4H9I
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Q. Which of the following compounds is a primary haloalkane?
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A.
CH3CH2CH2Cl
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B.
CH3Cl
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C.
C2H5CCl3
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D.
C6H5Cl
Solution
CH3CH2CH2Cl is a primary haloalkane as the carbon attached to the halogen is bonded to only one other carbon.
Correct Answer: A — CH3CH2CH2Cl
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Q. Which reagent can be used to convert an alkyl halide to an alcohol?
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A.
H2O
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B.
NaOH
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C.
KBr
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D.
HCl
Solution
NaOH can be used to convert an alkyl halide to an alcohol through nucleophilic substitution.
Correct Answer: B — NaOH
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