The reaction of $\mathrm{H}_{3} \mathrm{N}_{3} \mathrm{B}_{3} \mathrm{Cl}_{3}$ $(A)$ with $\mathrm{LiBH}_{4}$ in tetrahydrofurane gives inorganic benzene $(B)$. Further, the reaction of $(A)$ with $(C)$ leads to $\mathrm{H}_{3} \mathrm{N}_{3} \mathrm{B}_{3}(\mathrm{Me})_{3}$. than Compounds $(\mathrm{B})$ and $(\mathrm{C})$ respectively, are

A neutral molecule $XF_3$ has a zero dipole moment. The element $X$ is most likely

Heating an aqueous solution of aluminium chloride to dryness will give

Which hydrated elements of group $13$ are found as polymer in nature ? 

Aluminium chloride in acidified aqueous solution forms an ion having geometry