Total number of molecules, in which each covalent bond is comprised of back bond. \[ \mathrm{BF}...

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Total number of molecules, in which each covalent bond is comprised of back bond.
\[
\mathrm{BF}_{3}, \mathrm{~N}\left(\mathrm{SiH}_{3}\right)_{3}, \mathrm{PF}_{3}, \mathrm{POF}_{3}, \mathrm{~B}(\mathrm{OH})_{3}, \mathrm{O}\left(\mathrm{SiH}_{3}\right)_{2}, \mathrm{NH}\left(\mathrm{SiH}_{3}\right)_{2}, \mathrm{BFH}_{2}, \mathrm{BF}_{2}\left(\mathrm{NH}_{2}\right)
\]
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