In the reaction H - C CH [(2) CH _3 CH _2 Br ] (1) NaNH _2 ,/ , liq. NH _3 X [(2) CH _3 CH _2 Br ] (1) NaNH _2 ,/ , liq. NH _3 Y X and Y are:

NEET 2016 Chemistry question

In the reaction

H-C≡CH\ \ X\ \ Y

X and Y are:

(1)X = 1 - Butyne ; Y = 3 - HexyneCorrect
(2)X = 2 - Butyne ; Y = 3 - Hexyne
(3)X = 2 - Butyne ; Y = 2 - Hexyne
(4)X = 1 - Butyne ; Y = 2 - Hexyne

Answer: (1)

Solution

The terminal hydrogen of an alkyne is acidic, and the strong base removes it to form a sodium alkynide (an carbanion), which then attacks ethyl bromide in an alkylation. Step 1: \xrightarrow{NaNH_2}$ HC≡C^-Na^+

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Question ID VK-091881