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Which of the following reagents/reactions will convert 'A' to 'B'?

1. PCC oxidation
2. Ozonolysis
3. BH 3 , H 2 O 2 / – OH followed by PCC oxidation
4. HBr, hydrolysis followed by oxidation by K 2 Cr 2 O 7 .

Correct answer: BH 3 , H 2 O 2 / – OH followed by PCC oxidation

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