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Q. The $C-C$ bond distance is the longest in

KCETKCET 2022

Solution:

In $C_2 H_ 2$ there is $C \equiv C$. In $C_2 H_4$ and $C_2 H_ 2 Br_2$ there is $C = C$.
In $C _2 H_ 6$ there is $C - C$.
$C-C$ bond distance is longest.