Write structures of compounds A and B in each of the following reactions:

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Detailed Solution

Here are the structures of compounds A and B for each reaction shown in the image:

(i) Ethylbenzene Reaction

Starting Compound: Ethylbenzene (C6H5–CH2CH3)
Step 1: Oxidation with KMnO4/KOH (hot) converts the ethyl side chain to a carboxyl group.
- A: Potassium salt of benzoic acid (C6H5COOK)
Step 2: Acidification with H3O+ gives:
- B: Benzoic acid (C6H5COOH)

(ii) Cyclohexanol Reaction

Starting Compound: Cyclohexanol (Cyclohexane ring with –OH group)
Step 1: Oxidation with CrO3 gives:
- A: Cyclohexanone (Cyclohexane ring with a carbonyl group, C=O)
Step 2: Treatment with H2N–NH–CONH2 (semicarbazide) produces:
- B: Cyclohexanone semicarbazone (Cyclohexanone reacted with semicarbazide; structure is cyclohexane ring with C=N–NH–CO–NH2 group)

Summary Table: