Which of the following show diagonal relationship?

The structure of diborane $(B_2H_6)$ contains

In the following reaction,assign the state for the underlined atom in the product of complete hydrolysis at $R.T.$:
$H_4\underline{P}_2O_7 + H_2O \longrightarrow 2H_3PO_4$

Consider the compounds,$BCl_3$ and $CCl_4$. How will they behave with water? Justify.

$A$ compound $(A)$ of boron reacts with $NMe_3$ to give an adduct $(B)$ which on hydrolysis gives a compound $(C)$ and hydrogen gas. Compound $(C)$ is an acid. Identify the compounds $A, B$ and $C$. Give the reactions involved.

The structure of diborane $B_2H_6$ is given below. Identify the bond angles $x, y$. In diborane,which bonds are commonly known as banana-bonds?