Consider te following molecules:
Choose the correct comparison of stability:

I I I > I I > I V > I

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I V > I > I I I > I I

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I V > I I I > I I > I

No worries! We‘ve got your back. Try BYJU‘S free classes today!

I I I > I V > I I > I

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Solution

The correct option is A $I I I > I I > I V > I$
In chair conformers of cyclohexane there will be 1, 3 diaxial interaction which will reduce the stability of the conformer. Thus, bulky groups at axial position will destabilise the conformer, and group at equatorial position has less interaction so bulky groups at equatorial position pave the ways for the stability of conformers.
In (I), both $- C M e_{3}$ and $- C H_{3}$ are at axial position so it is least stable.
In (IV), $- C M e_{3}$ at axial position and $- C H_{3}$ at equatorial position so it is stable than (I).
In (II), $- C M e_{3}$ at equatorial position and $- C H_{3}$ at axial position so it is stable than (IV).
In (III). both $- C M e_{3}$ and $- C H_{3}$ are at equatorial position so it is the highest stable conformer.
Hence, the order of stability of conformer is
$I I I > I I > I V > I$

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