Question
Among the following the most stable compound is
✓
Answer
d
(d) Trans configuration is more stable than cis configuration because in cis-configuration the $H$ groups are thrown closely enough together to cause crowding or repulsion. Again between $1,2-$ and $1,3-$ configurations, in $1-3$, the $OH$ groups are placed further apart to minimise the repulsion. Hence, more stable is $1,3 -$ configuration.
(d) Trans configuration is more stable than cis configuration because in cis-configuration the $H$ groups are thrown closely enough together to cause crowding or repulsion. Again between $1,2-$ and $1,3-$ configurations, in $1-3$, the $OH$ groups are placed further apart to minimise the repulsion. Hence, more stable is $1,3 -$ configuration.
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