Question

Which of the following compounds contain both ionic and covalent bonds?

• A. $C{H}_{3}I$
• B. $C_2{H}_{4}C{l}_2$
• C. $H_2{O}_2$
• D. $KCN$

Answer 1

The correct option is D $KCN$

$C_2{H}_{4}C{l}_2$ is formed from three non-metals that are carbon, hydrogen, and chlorine. Thus, the bond is covalent.

$C{H}_{3}I$ is formed from three non-metals that are carbon, hydrogen and iodine. Thus, the bond is covalent in this case too.

$KCN$ is formed from two non-metals that are carbon and nitrogen and one metal that is potassium.
Ionic bond is formed between $K^{+}$ and the $C{N}^{-}$ and covalent bonds are formed between $N$ and $C$.

$H_2{O}_2$: It is composed of two elements hydrogen and oxygen which form covalent bonds.