General Organic ChemistryHard

Question

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

Options

A.Ethane
B.Ethylene
C.Acetylene
D.Hexachloroethane

Solution

    
    
In (b) and (c) ,rotation through C - C bond is restricted due to C = C and C ≡ C bonds. In (a) and (c), C - C free rotation is possible but in (d), it is hind ered due to presence of six bulkir - Cl atoms at neighbouring C-atoms.

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