Question

Which of the following molecules contains covalent and coordinate bonds?

• A. $CC{l}_4$
• B. $H_{2}S{O}_4$
• C. $NaCl$
• D. $Mg(OH{)}_2$

Answer 1

The correct option is B $H_{2}S{O}_4$

Coordinate bond is formed between electron rich and electron deficient atoms. The donor atom should have at least one lone pair of electrons and the acceptor atom should have at least one vacant orbital.

In $N{H}_4^{+}$, the nitrogen in $N{H}_3$ is electron rich and $H^{+}$ ion do not contain any electron. Thus nitrogen from $N{H}_3$ share pair of electrons with $H^{+}$ to make a coordinate bonds.

Other bonds in $N{H}_3$ are covalent bonds.

$N{H}_3+H^{+}\to N{H}_4^{+}$