1.

Product (A) & (B)n respectively in the above reaction are :

Answer»

`Ph-overset(O)overset(||)C-NH-CH_(3),Ph-overset(O)overset(||)C-NH-CH_(3)`
`CH_(3)-overset(O)overset(||)C-NH-Ph,CH_(3)-overset(O)overset(||)C-NH-Ph`
`Ph-overset(O)overset(||)C-NH-CH_(3),CH_(3)-overset(O)overset(||)C-NH-Ph`
`CH_(3)-overset(O)overset(||)C-NH-Ph,Ph-overset(O)overset(||)C-NH-CH_(3)`

SOLUTION :(c ) Anti-group migrate in Backmann rearrangement.
In reaction (1) `-CH_(3)` migrate , In reaction (2) -Ph migrate


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