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# Which of the following will have least hindered rotation about carbon-carbon bond?

$\begin{array}{1 1}(a)\;\text{Ethane}\\(b)\; \text{Ethylene}\\(c)\;\text{Acetylene}\\(d)\;\text{Hexachloroethane}\end{array}$

In ethylene there is restricted rotation where as in accetylene there is no rotation.Hexachloromethane has more rotation than ethylene but less than ethane because of larger size of chlorine atoms present in it than those of hydrogen atoms in ethane.
Hence (a) is the correct option.

so i think hexacholoroethane should be correct option