How many atoms lie in a straight line in the molecule 2-butyne, ${C H}_{3} C \equiv C {C H}_{3}$ ?

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Solution

The correct option is E 4
Due to $s p$ hybridization, the triply bonded C-atoms are in the same straight line, and as the terminal C-atoms of alkyl groups are also attached to them, hence, these terminal carbon atoms also lie in the same straight line.

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