Chemistry - Complete Pblock- Question with Solution | TestHub

$\mathrm{s}{\mathrm{p}}^3$hybridisation of B is responsible for shorter$\mathrm{B}-\mathrm{X}$distance

$\mathrm{B}-\mathrm{X}$has a double bond character due to back-bonding

Dimerisation takes place in$\mathrm{B}{\mathrm{X}}_3$which is responsible for shorter$\mathrm{B}-\mathrm{X}$distance

Due to large size of X,$\mathrm{B}-\mathrm{X}$distance decreases