1.

Bond angle in PH_3 si closer to 90^(@) while that in NH_3 is 104.5^(@).Which of the following best explains this structural feature?

Answer»

Due to larger size of the LONE pair electron cloud, there is larger lone pair - bond pair REPULSION in `PH_3` compared to `NH_3`
Higher electronegativity of nitrogen concentrates the bond pair electron cloud near the central ATOM which increases the bond pair - bond pair repulsion which in turn decreases the bond angle in `NH_3`
Energy difference between 3s an,d 3P orbitals is quite high and hence the lone pair on phosphorous prefers to occupy unhybridized s- orbital rather than hybridized `sp^3` hydridized orbital which causes its s-orbital energy to increase.
Phosphorous FORMS `ppi-dpi` bonds while nitrogen does not.

Answer :C


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