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Question

In which of the following conjugated double bond is present?


A

(A) 1,2−Butadiene

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B

(B) 1,3−Butadiene

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C

(C) 1,3−Pentadience

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D

(D) Both (B) and (C)

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Solution

The correct option is D

(D) Both (B) and (C)


Explanation for correct answer

The Correct Answer is (D) Both (B) and (C)

Conjugate bond

A conjugate bond is the arrangement of double bonds or triple bonds on the alternate carbon atom. The proximity of the alternate pi bonds allows them to interact across the single bond axis, giving a partial double bond.

Structure of

(B) 1,3 Butadiene

(C) 1,3 pentadiene

From, the above structure it is confirmed that 1,3 Butadiene and 1,3 pentadiene both have a conjugated double bond.

Explanation for Incorrect answers

(A) 1,2−Butadiene

Structure

The bonds in 1,2 butadiene is not conjugate but cumulative. Hence, option a is incorrect.


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