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Intermediates formed during reaction of RCNH2 with Br2 and KOH are

1. RNHBr and RCONHBr
2. RNHCObr and RNCO
3. RCONHBr and RNCO
4. RCONBr2

Correct answer: RCONHBr and RNCO

Solution

The reaction of RCNH2 with Br2 and KOH is the Hoffmann bromamide reaction, where the intermediate formed is RNCO (isocyanate). RCONHBr is also formed transiently during the reaction.

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