Question

Which pair of molecules has the strongest dipole–dipole interactions?

• A. $N{H}_3$ and $N{H}_3$
• B. $C{H}_4$ and $C{H}_4$
• C. $C{O}_2$ and $C{O}_2$
• D. $N{H}_3$ and $C{H}_4$

Answer 1

The correct option is A $N{H}_3$ and $N{H}_3$

$N{H}_3$ molecules have the strongest dipole - dipole interactions amongst all the given molecules due to intermolecular H - bonding as hydrogen is directly bonded to a electronegative atom $N$.