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

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

(A) Ethane 

(B) Ethylene 

 (C) Acetylene 

(D) Hexachloroethane 

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Correct option (A) Ethane

Explanation:

Free rotation around carbon-carbon bond takes place easily in alkanes. Now ethane and hexachloroethane both are alkanes, but in hexachloroethane bulky chlorine atom is present while ethane is least hindered. 

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