Question

$N{H}_3$ and $B{F}_3$ combine readily with the formation of:

• A. a covalent bond
• B. a hydrogen bond
• C. a coordinate bond
• D. an ionic bond

Answer 1

The correct option is C a coordinate bond

$B{F}_3$ acts as a Lewis acid which is an electron-deficient compound whereas $N{H}_3$ is a Lewis base which is an electron rich compound. Ammonia can donate its lone pair of electron in its the $s{p}^3$ hybrid orbital to the vacant p-orbital of $B{F}_3$ through co-ordinate bond.