Question: The barrier to rotation about the CC bond in bromoethane is 15kJ/mol (3.6kcal/mol). (a) What energy value can you assign to an HBr eclipsing interaction?

The barrier to rotation about the C—C bond in bromoethane is 15kJ/mol (3.6kcal/mol).

(a) What energy value can you assign to an H—Br eclipsing interaction?

(b) Construct a quantitative diagram of potential energy versus bond rotation for bromoethane.

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