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Q.

The energy barrier to rotation about the C−C bond in ethane is about 12.55kJ/mol at room temperature (298 K). Assuming the contribution of entropy negligible, the ratio of staggered to eclipsed conforations is about

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a

150

b

175

c

165

d

159

answer is B.

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Detailed Solution

The ratio of staggered to eclipsed conforations is,

Keq=exp⁡(−ΔG/RT) =exp⁡(12550/8.314×298)≃159

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