Which of the following hybridization is known as trigonal hybridization?

When $BCl_3$ is treated with water,it hydrolyses and forms $[B(OH)_4]^-$ only,whereas $AlCl_3$ in acidified aqueous solution forms $[Al(H_2O)_6]^{3+}$ ion. Explain what are the hybridizations of boron and aluminum in these species?

The $C-C$ bond length of the following molecules is in the order:

What is the hybridization of $Xe$ in $XeF_2$?

Is there any change in the hybridisation of $B$ and $N$ atoms as a result of the following reaction?
$BF_{3} + NH_{3} \rightarrow F_{3}B \cdot NH_{3}$

In which of the following changes is there no change in the hybridisation of the central atom?