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(A) In $3-$Hydroxypropanal $(HO-CH_2-CH_2-CHO)$,the most stable conformation is the $Gauche$ form.This is due to the formation of an intramolecular hy

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Gauche

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(A) In $3-$Hydroxypropanal $(HO-CH_2-CH_2-CHO)$,the most stable conformation is the $Gauche$ form.This is due to the formation of an intramolecular hydrogen bond between the hydroxyl group $(-OH)$ and the carbonyl oxygen $(C=O)$.Although the $Anti$ conformation is generally more stable due to reduced steric hindrance,the stabilization provided by the intramolecular hydrogen bond in the $Gauche$ conformation makes it the most stable conformer for this specific molecule.

The Newman projection formula of the most stable conformation of $3-$Hydroxypropanal is:

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