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The reaction of O || NH C R 2 − − with bromine and KOH gives RNH 2 as the end product. Which one of the following is the intermediate product formed in this reaction?

1. O || Br NH C R − − −
2. R – NH – Br
3. R – N = C = O
4. O || NBr C R 2 − −

Correct answer: R – N = C = O

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