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Question

Which of the following has highest proton affinity:

A
Stilbine
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B
Arsine
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C
Phosphine
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D
Ammonia
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Solution

The correct option is D Ammonia
As the size of the nitrogen in ammonia is less than the other elements in the hydrides of that group ammonia has the more affinity towards the proton than the any other hydride of that group like phosphine, stobine and arsine.
Hence option D is correct.

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