A) B
B) Al
C) Ga
D) In
Correct Answer: A
Solution :
The required 13 group element is Boron. When it reacts with chlorine then it form\[BC{{l}_{3}}\] The reaction is as follow: \[2B+3C{{l}_{2}}\to 2BC{{l}_{3}}\] When it reacts with\[N{{H}_{3}}\]then it forms adduct which can be represented as\[BC{{l}_{3}}\leftarrow N{{H}_{3}}\] and with excess of ammonia it forms boron nitride. \[BC{{l}_{3}}+4N{{H}_{3}}\to BN+3N{{H}_{4}}Cl\] \[BC{{l}_{3}}\]is electron deficient group but it does not form dimer like Al, Ga or In because its electron deficiency is complemented by the formation of co-ordinate bond between lone pair of electron of chlorine and empty unhybridized p-orbital of boron forming \[p\pi -p\pi \]bonding.
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