The correct statement$(s)$ about $B_2H_6$ is/are:

Which of the following is an incorrect statement about the compounds of group $13$ elements?

The number of neutrons present in the more abundant isotope of boron is $x$. Amorphous boron upon heating with air forms a product,in which the oxidation state of boron is $y$. The value of $x+y$ is ...

What are $X$ and $Y$ respectively in the following reactions?
$X \xleftarrow{CO} B_2 H_6 \xrightarrow[(C_2 H_5)_2 O]{NaH} Y$

Discuss the pattern of variation in the oxidation states of $(i)$ $B$ to $Tl$ and $(ii)$ $C$ to $Pb$.

$BCl_3$ exists as a monomer,whereas $AlCl_3$ is dimerized through halogen bridging. Give reason. Explain the structure of the dimer of $AlCl_3$ also.