MCQ
Unknown $(A)$ in the reaction


- ✓

- B

- C

- D








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$(W)$ Red ppt. $\xrightarrow{{dil.\,\,HCl}}$ $(Y)$ white ppt.
$(U)$ $\mathop {\xrightarrow{{NaOH}}}\limits_\Delta $ $(Z)$ gas (gives white fumes with $HCl$ ) ?
sublimes on heating
Identify $(T)$ to $(Z).$
$(a)$ $PhCOOH$
$(B)$ $o-NO_2C_6H_4COOH$
$(C)$ $p-NO_2C_6H_4COOH$
$(D)$ $m-NO_2C_6H_4COOH$