Chemistry - STEREO ISOMERISM Question with Solution | TestHub
Match the following :
List - I | List - II |
|---|---|
(P)
| (1) Conformation with minimum vander-waal strain |
(Q)
| (2) Conformation with maximum vander-wall stain |
(R)
| (3) Conformation of maximum torsional strain |
(S)
| (4) Conformation with minimum torsional strain |
Options:
Answer:
Solution:
Question Explanation: Match the Newman projections of butane with their characteristic strains. Concept: Strains in Molecular Conformations. Solution: Conformations of butane ( vary in stability based on strain: (P) Partially Eclipsed: Bulky methyl groups are near hydrogens. Result: High torsional strain (3). (Q) Fully Eclipsed: Bulky methyl groups are directly over each other. Result: Maximum van der Waals strain (2). (R) Anti: Methyl groups are 180° apart. Result: Minimum van der Waals strain (1). (S) Gauche: Methyl groups are 60° apart. Result: Minimum torsional strain (4) among staggered types (though anti is lower). Final Answer: Option (B)
