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a
i>ii>iii
b
ii>i>iii
c
iii>i>ii
d
iii>ii>i
answer is C.
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Detailed Solution
Stability α1 Heat of combustion Stability order is ii > i > iii(6-membered.irrg is more stable than 5-membered ring which is more stable than 3-membered ring)So heat of combustions is iii > i > ii