Which of the following will give allene, CH_2=C=CH_2?

JEE Main Chemistry question

Which of the following will give allene, CH=C=CH?

(A)CHBr–CBr=CH Correct
(B)HCC–CH–COOH
(C)2 CH=CH–CHI
(D)None of the above

Answer: (A)

Solution

2,3-Dibromopropene, CHBr–CBr=CH, already has a C2=C3 double bond; Zn removes the two bromines on the adjacent C1–C2 carbons, generating a *second* double bond (C1=C2) while

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Question ID VK-142631