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What's the point group of trimethyl borate $\ce{B(OCH_3)3}$. The answer that my teacher gave is $D_{3h}$ but I'm struggling to see the n perpendicular $C_2$ axes and the horizontal plane of reflection.

enter image description here

enter image description here

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    $\begingroup$ It's c3h without the perpendicular c2 axis. $\endgroup$ Commented Dec 28, 2023 at 1:12
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    $\begingroup$ You can see some other $C_{3h}$ molecules as this site molecule-viewer.com where there are also many examples and also of most other point groups. You can add axes and planes etc to help identify. $\endgroup$
    – porphyrin
    Commented Dec 28, 2023 at 9:01

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Depends on what conformation you're talking about. It can be $C_1$, $C_\mathrm{s}$, $C_3$, $C_\mathrm{3h}$, or $C_\mathrm{3v}$. This particular conformation that you provided the image, with $\ce{H-C-O-B}$ angle of $180^\circ$, the point group is $C_\mathrm{3h}$.

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