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Identify the compounds A, B, C and D. ...

Identify the compounds A, B, C and D.
`C_(6)H_(5)COOH overset(SOCl_(2))to A overset(NH_(3))to B overset(Br_(2)//KOH) to C underset(0-5^(@)C)overset(NaNO_(2) +HCl)to D`

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