Question

The bond angle in ${\mathrm{PH}}_3$ is?

Answer 1

The bond angle in ${\mathrm{PH}}_3$:

• Phosphine is known as a Drago molecule in which no hybridization takes place.
• According to Drago's rule, the central atoms belonging to groups 13, 14, 15, 16 or from the 3rd to 7th period do not undergo hybridization.
• During the formation of ${\mathrm{PH}}_3$, the pure p orbitals take part in bonding, whereas the lone pair orbital is mainly present in the s orbital.
• Phosphorus generally forms three bond pairs and has one lone pair.
• As ${\mathrm{PH}}_3$does not undergoes the hybridization, hence its bond angles have the value of $93°$, which is greater than the usual tetrahedral bond angle i.e $90°.$

Hence, the bond angle in ${\mathrm{PH}}_3$ is $93°$.