An ion with a positively charged nitrogen atom in a three-membered ring is called an aziridinium ion. The following aziridinium ion reacts with sodium methoxide to form A and B:

If a small amount of aqueous Br2 is added to A, the reddish color of Br2 persists, but the color disappears when is added to B. When the aziridinium ion reacts with methanol, only A is formed. Identify A and B.

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н,с N CH HaC an aziridinium ion CH3