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Question

Compare the relative stabilities of the given compounds:

A
p>q>r
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B
q>p>r
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C
q>r>p
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D
p>r>q
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Solution

The correct option is D p>r>q
Stability of the canonical structures are decided by following factors.
i) Neutral structures are most stable.
ii) Greater the number of covalent bonds, greater is the stability
iii) Structure with a negative charge on the more electronegative atom will be more stable.
iv) Charge separation: like charges should be at the maximum distance.
Hence, the stability order is:p>r>q

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