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Question

Among the following, the correct statement(s) is/are:
Between NH3 and PH3

A
NH3 is a better electron donor because the lone pair of electrons occupies the spherical s orbital and is less directional
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B
PH3 is a better electron donor because the lone pair of electrons occupies the sp3 orbital and is more directional
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C
NH3 is a better electron donor because the lone pair of electrons occupies the sp3 orbital and is more directional
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D
PH3 is a better electron donor because the lone pair of electrons occupies the spherical s orbital and is less directional
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Solution

The correct option is C NH3 is a better electron donor because the lone pair of electrons occupies the sp3 orbital and is more directional
In NH3 lone pair on N is present in sp3 hybridised orbital and hence is more directional.
Whereas in PH3 lone pair is present mainly in 3s orbital also the bond angle in PH3 is almost 90o and such compounds are regarded as drago compounds.
So NH3 is more basic than PH3

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