Chemistry - CHEMICAL BONDING Question with Solution | TestHub

$p\pi -d\pi$ back bonding is possible in ${\mathrm{B}}_2{\mathrm{H}}_6$ but not in ${\mathrm{B}}_2{\mathrm{Cl}}_6$

boron and hydrogen have almost equal values of electronegativity

boron and chlorine have almost equal atomic sizes

small hydrogen atoms can easily fit in between boron atoms but large chlorine atoms do not.