Identify total number of compounds in which Gauche conformation is more stable than it's anti conformation :

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The total number of compounds where the Gauche conformation is more stable than the anti conformation is 3.

Compounds (i) and (ii) are stabilized in the gauche form due to intramolecular hydrogen bonding between the $- O H$ and $- O H / - C H O$ groups.

Compound (iv) is stabilized in the gauche form due to strong electrostatic attraction between the oppositely charged $- O^{-}$ and $- N H_{3}^{+}$ groups.

For compounds (iii), (v), and (vi), the anti conformation is more stable due to steric hindrance (in iii), electrostatic repulsion between like charges (in v), and dipole-dipole repulsion (in vi).

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