Which is the most stable conformer along the | vedclass

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(C) To determine the most stable conformer,we analyze the steric hindrance in the Newman projection. Stability is generally governed by minimizing ste

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The Newman projection with $F$ and $C_2H_5$ anti to each other.

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(C) To determine the most stable conformer,we analyze the steric hindrance in the Newman projection. Stability is generally governed by minimizing steric repulsion between bulky groups. In the given molecule,the bulky groups are the ethyl group $(-C_2H_5)$ and the methyl groups $(-CH_3)$. The most stable conformation is the one where the largest groups are as far apart as possible (anti-periplanar). By converting the given structure to a Newman projection,we find that placing the largest group (ethyl) anti to the other large group (methyl) or minimizing the gauche interactions between bulky groups leads to the most stable conformer. Based on the standard analysis of conformational stability for this molecule,the conformer where the largest groups are anti to each other is the most stable.

Which is the most stable conformer along the $2, 3$-$C-C$ bond axis of the compound?

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