Home Chemistry Hydrocarbon General Choose the incorrect statement -
Chemistry Hydrocarbon General Single Correct MCQ
Published on: August 12, 2026

Choose the incorrect statement -

A
2,2-dichlorobutane on treatment with KOH, C 2 H 5 OH initially give mainly E-2-chlorobut-2-ene.
B
2,2-dichlorobutane requires exactly 2 equivalents of NaNH 2 to be converted to into but-1-yne
C
But-2-yne on treatment with excess NaNH 2 ;H + give but-1-yne
D
2,2-dichlorobutane on treatment with KOH, 200ºC, give but-2-yne while treatment with NaNH 2 (excess), 150ºC, H + give but-1-yne

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(a, b) 2,2-dichlorobutane Z-2-chlorobut-2-ene 2,2-dichlorobutane requires 3 equivalents of NaNH 2 to convert dihalide into alkyne completely. After first dehydrochlorination instantly formed alkyne starts to react NaNH 2 and for the removal of second mole of HCl NaNH 2 is not available in appropriate amount.

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