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a
i > ii > iv > iii
b
iii > i > ii > iv
c
iv > ii > iii > i
d
ii > iv > iii > i
answer is D.
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Detailed Solution
(i) Due to ring strain it is least stable(ii) 4 α-hydrogens, produce 4 hyperconjugative structures.(iii) resonance stabilized.(iv) one α-hydrogen, produce 1hyperconjugative structure.Hence ii > iv > iii > i