Question

Why can free rotation occur easily around a $\sigma$ -bond axis but not around a $\pi$ -bond axis? $10.35$ Using sketches, describe the bonds and bond angles in ethene, $\mathrm{C}_{2} \mathrm{H}_{4}$ $10.36$ Sketch the way the bonds form in acetylene, $\mathrm{C}_{2} \mathrm{H}_{2}$. $10.37$ How does VB theory treat the benzene molecule? (Draw sketches describing the orbital overlaps and the bond angles.)

          Why can free rotation occur easily around a $\sigma$ -bond axis but not around a $\pi$ -bond axis?
$10.35$ Using sketches, describe the bonds and bond angles in ethene, $\mathrm{C}_{2} \mathrm{H}_{4}$
$10.36$ Sketch the way the bonds form in acetylene, $\mathrm{C}_{2} \mathrm{H}_{2}$.
$10.37$ How does VB theory treat the benzene molecule? (Draw sketches describing the orbital overlaps and the bond angles.)

Added by Benjamin C.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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Solved by Expert Oluwapelumi Kolawole

Step 1

A $\sigma$ bond is formed by the overlap of two atomic orbitals along the internuclear axis, while a $\pi$ bond is formed by the overlap of two atomic orbitals above and below the internuclear axis. Now, why can free rotation occur easily around a $\sigma$-bond Show more…

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Why can free rotation occur easily around a $\sigma$ -bond axis but not around a $\pi$ -bond axis? $10.35$ Using sketches, describe the bonds and bond angles in ethene, $\mathrm{C}_{2} \mathrm{H}_{4}$ $10.36$ Sketch the way the bonds form in acetylene, $\mathrm{C}_{2} \mathrm{H}_{2}$. $10.37$ How does VB theory treat the benzene molecule? (Draw sketches describing the orbital overlaps and the bond angles.)