Question

what is the structural isomer of C4H10 (C-C-C-C dihedral angle=60)?

Answer 1

Explanation:

Below are two representations of butane in a conformation which puts the two CH3 groups (C1 and C4) in the eclipsed position. This is the highest energy conformation for butane, due to what is called 'van der Waals repulsion', or 'steric repulsion', between the two rather bulky methyl groups

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