Two of the many isomers with the molecular formula C8Hi8, are shown below (2, 2-

Question

Two of the many isomers with the molecular formula C8Hi8, are shown below (2, 2-dimethyl-4-methylpentane and 2, 2-dimethyl-3-methylpentane). At any given time, these molecules can be in one of many different rotational conformations, or conformers. It takes energy to convert between conformers (1 rightarrow2 and 3 rightarrow 4) because they must pass through an unstable eclipsed structure. Comparing the processes above relative to each other, where Ea1rightarrow Ea2, which of the following statements is true about the transition from 1 2 versus 3 rightarrow 4? Ea1 is greater than Ea2 because of tensional and steric strain during bond rotation. 1 is greater than Ea2 because kinetics favor 1 rightarrow 2 versus 3 rightarrow 4. The rotation from 1 rightarrow 2 is faster than the rotation from 3 rightarrow 4. The rotation from 3 rightarrow4 is faster than the rotation from 1 rightarrow 2.Both 1 and 3 are thermodynamically more stable than 2 and 4.

Explanation / Answer

The correct options are as follows:

II. Ea1 is greater than Ea2 because, the 1 and 3 are unstable and 2 and 4 are more stable (As they are anti conformers).

IV. The rotaion of 3 to 4 is faster than 1 to 2 as Ea1 is greater than Ea2.

V. Both 1and 3 are thermodynamically more stable than 2 and 4.

The correct option is (F).

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