Statement-1 : Boron always forms covalent bond. Statement-2 : The small size of $\mathrm{B}^{3+}$ fa

Question

Statement-1 : Boron always forms covalent bond. Statement-2 : The small size of $\mathrm{B}^{3+}$ favours formation of covalent bond.\

Professor PC Thomas Classes · Answer

(a) : $\mathrm{B}^{3+}$ has very small size and due to its very high charge, it has high polarising power. So as per Fajan's rule, boron forms covalent compound. Moreover, due to its small size, the ionisation potential value of $B$ is too high to form $\mathrm{B}^{3+}$ ion.\