Identify (A) to (C).

Explanation

DU in `A=((2xx8+2)-10)/(2)=4^@`
DU in `B=((2xx4+2)-6)/(2)=2^@`
Structure of `Bimplies`since it is an acid `(C_3H_5COOH)`. In (B), 1 DU is accounted for acid group, another 1 DU is present in `(C_3H_5)`. It should be a 3 C atom ring, not `(C=C)`, since after ozonolysis or oxidative cleavage `(C=C)` bond or `(C-=C)` bond cannot be left behind. So the structure of `Bimplies` `-COOH`
Total C atoms in `A=8`
Total C atoms in `B=4`
Therefore, 2 mol of (B) is produced.
So the structure of `(A)implies`
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Note: Cyclopropane on catalytic hydrogenation in ordinary conditions of temperature are cleaved to give propane, whereas other high-membered ring do not undergo catalytic hydrogenation under similar conditions.