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AIIMS2018Chemistry-Organic Chemistry

AIIMS 2018 Chemistry Alkenes and Alkynes MCQ Question

Type: MCQ-conceptual-Medium-Class 11

In the following sequence of reactions, which is incorrect

CH2=CH−CH=CH2→80°CHBrA→HBrB→MgC\text{CH}_2=\text{CH}-\text{CH}=\text{CH}_2 \xrightarrow[\text{80°C}]{\text{HBr}} \text{A} \xrightarrow{\text{HBr}} \text{B} \xrightarrow{\text{Mg}} \text{C}

A

A\text{A} is CH3−CH=CH−CH2Br\text{CH}_3-\text{CH}=\text{CH}-\text{CH}_2\text{Br}

B

B\text{B} is CH3CHBr−CH2−CH2−Br\text{CH}_3\text{CHBr}-\text{CH}_2-\text{CH}_2-\text{Br}

C

C\text{C} is cyclopropyl methane.

D

B\text{B} via SN2\text{S}_\text{N}2 with aqueous NaOH\text{NaOH} gives CH3CHOH⋅CH2CH2Br\text{CH}_3\text{CHOH}\cdot\text{CH}_2\text{CH}_2\text{Br} and not CH3CHBr⋅CH2CH2OH\text{CH}_3\text{CHBr}\cdot\text{CH}_2\text{CH}_2\text{OH}

Correct Answer

Option D

Detailed Explanation

Option D is correct because the question does not provide sufficient information about the reactants or the specific reaction conditions, making it impossible to determine a valid product. The other options suggest specific organic compounds that imply certain reaction pathways, but without context, such as the type of reaction (e.g., substitution, elimination, or addition), these products cannot be accurately predicted. Therefore, without additional details, none of the proposed products can be confirmed as correct.

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