What is the nature of the bond between $B$ and $O$ in $(C_2H_5)_2OBH_3$?

The $H_2SO_4$ molecule contains .......

What is common between $NH_3$ and $PH_3$?

The unshared pair of electrons on a cyanide ion can act as

In the reaction $BCl_3 + PH_3 \rightarrow Cl_3B^{-}PH_3$,the Lewis base is:

Which of the following is the correct representation of the reaction when $BF_3$ reacts with ammonia?
$(i)$ $F_3B + :NH_3 \rightarrow [F_3B \leftarrow :NH_3]$
(ii) $F_3B + :NH_3$ $\rightarrow [F_3B$ $\rightarrow :NH_3]$