A) \[{{C}_{2}}{{H}_{5}}\]
B) \[C{{H}_{2}}=C{{H}_{2}}\]
C) \[CH\equiv CH\]
D) Hexa chloro ethane
Correct Answer: A
Solution :
\[{{C}_{2}}{{H}_{5}}\] will have least hindered rotation about carbon-carbon.
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