Column - I Column - II (P) Compound has even number of stereoisomers. (Q) Gauche form is more stable due to intramolecular H-bonding. (R) Meso isomer is more stable than optically active isomer. (S) One of the stereoisomers contain plane of symmetry.

Engineering

Chemistry

Conformational Isomerism

Optical Isomerism

Question

Column - I	Column - II
	(P) Compound has even number of stereoisomers.
	(Q) Gauche form is more stable due to intramolecular H-bonding.
	(R) Meso isomer is more stable than optically active isomer.
	(S) One of the stereoisomers contain plane of symmetry.

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This question tests concepts of stereochemistry: stereoisomer counting, conformational stability, and symmetry.

For (P): A molecule with two chiral centers and no symmetry can have up to $2^{n}$ stereoisomers (n=chiral centers). An even number is common.

For (Q): Gauche conformation in 1,2-disubstituted ethanes can be stabilized by intramolecular H-bonding if present.

For (R): A meso compound, having a plane of symmetry, is often more stable than its diastereomers due to this symmetry.

For (S): A meso stereoisomer, by definition, contains a plane of symmetry.

Final Answer: The correct matches depend on analyzing each structure for chiral centers, potential H-bonding, and symmetry elements.