Which of the following is the correct order of the reducing power of $Al, Ga, In,$ and $Tl$?

What is added to borax to obtain boric acid?

The Lewis acid nature of $BX_3$ follows the order:

Which of the following statements is correct?

Which of the following is a non-metal?

Identify the correct statement for $B_2H_6$ from those given below.
$(A)$ In $B_2H_6$,all $B-H$ bonds are equivalent.
$(B)$ In $B_2H_6$ there are four $3$-centre-$2$-electron bonds.
$(C)$ $B_2H_6$ is a Lewis acid.
$(D)$ $B_2H_6$ can be synthesized from both $BF_3$ and $NaBH_4$.
$(E)$ $B_2H_6$ is a planar molecule.
Choose the most appropriate answer from the options given below.