Multiple choice

The effect hindering the bond rotation is

  1. the Gauche effect

  2. the beta-silicon effect

  3. an anomeric effect

  4. the Baker-Nathan effect
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A Correct answer
Explanation

The Gauche effect characterizes any gauche rotamer which is actually more stable than the anti rotamer.This effect is present in 1,2-difluoroethane (H2FCCFH2) for which the gauche conformation is more stable by 2.4 to 3.4 kJ/mole in the gas phase. Another example is 1,2-dimethoxyethane. In stereochemistry, gauche interactions hinder bond rotation.

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