Match the Column (I) and (II).

Answer

a - s; b-r; c-q; d-p

Explanation

The chair conformer with the methyl substituent in an equatorial position is more stable because a substituent has more room and, therefore, fewer steric interactions when it is in an equatorial position. When the methyl group is in an equatorial position, it is anti to the C-3 and C-5 carbons (Figure). Therefore, the substituent extends into space away from the rest of the molecule. In contrast, when the methyl group is in an axial position, it is gauche to the C-3 and C-5 carbons (fig.)

As a result, there are unfavourable steric interactions between the axial methyl group and both the axial substituent on C-3 and the axial substituent on C-5 (in this case hydrogens). In other words, the three axial bonds on the same side of the ring are parallel to each other, so any axial substituent will be too close to the axial substituents on the other two carbons. Because the interacting substituents are on 1, 3-positions relative to each other, these unfavourable steric interactions are called 1, 3-diaxial interactions
`**`Alkyl group occupy equational position to achieve maximum stability.
`**` If the size of alkyl group increase, then stability of conformer will increase and value of equillibrium constant will also increase.