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Identify A and B in the following sequence of reaction. CH 3 Cl 2 /h ν A H 2 O 373 K B

1. CHCl 2 A= COOH B =
2. CHCl 2 A= CHO B =
3. COCl A= CHO B =
4. CH 2 Cl A= CHO B =

Correct answer: CHCl 2 A= CHO B =

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