Consider the following bonds:

CHEMISTRY · Single correct · A Level · Chemistry · Introduction to organic chemistry · Introduction to organic chemistry

Problem

Consider the following bonds: (I) the C–C bond in ethane, (II) the C–N bond connecting the carbonyl carbon and nitrogen in acetamide, (III) the C=C bond in ethene. Which sequence lists these bonds in order of increasing barrier to rotation about the bond axis? (a) II<I<III\mathrm{II} < \mathrm{I} < \mathrm{III} (b) I<III<II\mathrm{I} < \mathrm{III} < \mathrm{II} (c) I<II<III\mathrm{I} < \mathrm{II} < \mathrm{III} (d) III<II<I\mathrm{III} < \mathrm{II} < \mathrm{I}

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