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Question

Which of the following is the most stable conformer of butane-2,3-diol?

A
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B
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C
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D
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Solution

The correct option is B
Conformer (b) is more stable than (a).
Here, (a) is staggered (anti) conformer and (b) is staggered gauche conformer of butane-2,3 diol.
Generally, staggered conformers are most stable than the eclipsed and gauche conformer due to less torsional strain but here gauche conformer of butane-2,3 diol is stable than the staggered conformer due to the formation of hydrogen bonding.

(c) and (d) are not conformers of butane-2, 3-diol.
Hence, (b) is stable conformers of butane-2, 3-diol.

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