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Distinguishing Test of Terminal and Non Terminal Alkynes

The major pro...

Question

The major product of the following reaction is:

$C H_{3} C | B r H C H_{2} C | B r H C H_{2} C H_{3} K O H, C H_{3} O H - -------- \to h e a t$

A

C H_{3} C H = C H - C H = C H C H_{3}

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B

C H_{3} C H = C = C H C H_{2} C H_{3}

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C

C H_{2} = C H C H_{2} C H = C H C H_{3}

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D

C H_{2} = C H C H = C H C H_{2} C H_{3}

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Solution

The correct option is A $C H_{3} C H = C H - C H = C H C H_{3}$
Conjugated alkene in which double bonds are more substituted is the major product. When dibromoalkane is heated with $C H_{3} O H / K O H$ , it undergoes dehydrohalogentation. Two molecules of $H B r$ are eliminated to form alkadiene.

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