JEE Main Chemistry question

R–CH₂–CH₂OH can be converted into R–CH₂–CH₂–H. The correct sequence of reagents is

(A)KCN, H⁺
(B)PBr₃, KCN, H₂Correct
(C)HCN, PBr₃, H⁺
(D)PBr, KCN, H⁺

Answer: (B)

Solution

To remove the –OH entirely and replace it with H (deoxygenation), the alcohol is first converted to the alkyl bromide (PBr₃), and reductive removal of the halide (e.g. with H₂/catalyst, or via a radical/ionic dehalogenation step broadly denoted "H₂" here) replaces Br with H, giving the simple alkane with the

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Question ID VK-149433