match the column (I) and (II).

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1.	match the column (I) and (II).
Answer» Solution :The chair conformer with 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 constrast, 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 unfavourble steric interactions between the axial methyl group and both the axias substituent on C-3 and the axial substituent of C-5 (in this case HYDROGENS). In other words, the three axial bonds on the same side of the ring are parallel to each 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 ocupy equational position to achieve maximum stability. `*` If the size of alkyl group increase, then stability of conformer will increase and VALUE of equilibrium constant will also increase.

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