JEE Main Chemistry question

Which of the following can be used for the preparation of propane?

(A)CHCH=CH
(B)CHCHCHCl Correct
(C)CHCHCHI
(D)CHCHCHCOONa

Answer: (B)

Solution

(B) forms the Grignard reagent CHCHCHMgCl from *n*-propyl chloride, which is then protonated by water to give propane directly. (A) (hydroboration–oxidation) gives propan-1-ol, not propane; (C) (HI/heat on an alkyl iodide) effects

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Question ID VK-142430