Question

Which of the following contains a coordinate covalent bond?

• A. $N{H}_{3}B{F}_3$
• B. $BaC{l}_2$
• C. HCl
• D. $H_{2}O$

Answer 1

The correct option is A

$N{H}_{3}B{F}_3$

$\bullet$ In covalent bond each of the two bonded atoms contribute one electron to form the bond. Whereas an ionic bond is formed by the transfer of electrons.

$\bullet$ However, in some compounds, the formation of a covalent bond between two atoms takes place by the sharing
of two electrons, both of which comes from only one of the combining atoms. This bond is called coordinate covalent bond.

$\bullet$ Here, $HCl$ and $H_{2}O$ are covalent compounds. $BaC{l}_2$ is an ionic salt. While in $N{H}_{3}B{F}_3$ nitrogen bonds with boron by sharing its lone pair which is a coordinate covalent bond.