Questions  

Which of the following has the highest proton affinity ?

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By Expert Faculty of Sri Chaitanya
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a
Stibine SbH3
b
Arsine AsH3
c
Phosphine PH3
d
Ammonia NH3
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detailed solution

Correct option is D

High electron density on small N atom repel lone pair, making it more available for protonation. From P to Bi size of atom increases and so lone pair becomes less available for protonation.

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