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Answer 1

Answer:

The rotational barrier is the activation energy required to convert one rotamer to another. Atropisomers are rotamers in which the barrier to rotation about a single σ bond is so high, usually due to steric hindrance, that the separate rotamers (stereoisomers) can be isolated <2004T4335>.Experiments show that there is a 12 kJ/mol (2.9 kcal/mol) barrier to rotation in ethane. ... The barrier to rotation is the result of three equal C–H bond-eclipsing interactions, so we can assign a value of about 4.0 kJ/mol (1.0 kcal/mol) to each of these interactions option is b

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