In which of the following compounds is sp^2 hybridisation absent?

JEE Main Chemistry question

In which of the following compounds is hybridisation absent?

(A)CH_2=CH-CH=CH_2 (1,3-butadiene)
(B) (but-1-yne)Correct
(C) (propene)
(D)CH_2=CH-CH_2-CH_3 (but-1-ene)

Answer: (B)

Solution

1,3-Butadiene has all four carbons (conjugated diene). Propene and but-1-ene each have two alkene carbons (plus carbons elsewhere). But-1-yne, however, has

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Question ID VK-155988