Which of the following has the highest proton affinity ?
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a
Stibine SbH3
b
Arsine AsH3
c
Phosphine PH3
d
Ammonia NH3
answer is D.
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Detailed Solution
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.