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Consider a Newman Projection for 2,2,3-trimethylbutane. Which of the following is true?

A. The most stable conformation of the molecule has two gauche butane interactions with 7.6 kJ/mol of strain energy.
B. The least stable conformation has 28 kJ/mol of torsional strain energy.
C. The most stable conformation of the molecule has no torsional strain interactions.
D. The least stable conformation of the molecule has 22 kJ/mol of strain energy.

Answer :

Final answer:

The most stable conformation of 2,2,3-trimethylbutane has no torsional strain interactions.

Explanation:

In the Newman projection for 2,2,3-trimethylbutane, the most stable conformation of the molecule is the one with no torsional strain interactions. This means that the methyl groups are in a staggered conformation, minimizing steric hindrance. In this conformation, there are no gauche butane interactions, which would occur if two methyl groups were close to each other.

The least stable conformation of the molecule has 28 kJ/mol of torsional strain energy. This conformation occurs when the methyl groups are in an eclipsed conformation, causing steric hindrance and higher energy.

Therefore, the correct statement is that the most stable conformation of the molecule has no torsional strain interactions.

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