NEET 2011 Chemistry question

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear ?

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

A molecule is linear only if all its carbon atoms are hybridised (bond angle ). In but-2-yne, , the two triple-bonded carbons are and the carbons joined to them lie on the same straight line with them, so the four carbon skeleton is linear. In (1)

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Question ID VK-090775