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Question: Which of the following reactions gives \(H_{2}C = C = C = CH_{2}\)....

Which of the following reactions gives

H2C=C=C=CH2H_{2}C = C = C = CH_{2}.

A

CH2Br−CBr=CH2→Zn/Ch3OHCH_{2}Br - CBr = CH_{2}\overset{\quad Zn/Ch_{3}OH\quad}{\rightarrow}

B

HC≡C−CH2−COOH→Aq.K2CO340oCHC \equiv C - CH_{2} - COOH\underset{40^{o}C}{\overset{\quad Aq.K_{2}CO_{3}\quad}{\rightarrow}}

C

CH2Br−C≡C−CH2Br→ZnHeatCH_{2}Br - C \equiv C - CH_{2}Br\underset{\text{Heat}}{\overset{\quad Zn\quad}{\rightarrow}}

D

2CH2=CH−CH2I→2CH_{2} = CH - CH_{2}I\underset{}{\overset{\quad\quad}{\rightarrow}}

Answer

CH2Br−C≡C−CH2Br→ZnHeatCH_{2}Br - C \equiv C - CH_{2}Br\underset{\text{Heat}}{\overset{\quad Zn\quad}{\rightarrow}}

Explanation

Solution

CH2Br−C≡C−CH2Br→ZnΔCH2=C=C=CH2CH_{2}Br - C \equiv C - CH_{2}Br\underset{\Delta}{\overset{\quad Zn\quad}{\rightarrow}}CH_{2} = C = C = CH_{2}