Match the regents used for the detection of elements in organic compounds
                Reagent                                               Element
                A) Lead acetate                                1) P
                B) Silver nitrate                                 2) N
                C) Ammonium molybdate            3) S
                D) $Fe S O_{4} + F e C l_{3}$                   4) $C l$

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A:3;B:1;C:2;D:4

A:3;B:4;C:1;D:2

A:3;B:4;C:2;D:1

A:4;B:3;C:2;D:1

answer is B.

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Detailed Solution

${Na}_{2} S + {({CH}_{3} COO)}_{2} Pb ⟶ \underset{(Black ppt.)}{PbS} + 2 {CH}_{3} COONa$

$NaCl + {AgNO}_{3} ⟶ \underset{(White ppt.)}{AgCl} + {NaNO}_{3}$

$\begin{matrix} {Na}_{3} {PO}_{4} + 3 {HNO}_{3} ⟶ H_{3} {PO}_{4} + 3 {NaNO}_{3} \\ H_{3} {PO}_{4} + 12 {({NH}_{4})}_{2} {MoO}_{4} + 21 {HNO}_{3} ⟶ \\ {({NH}_{4})}_{3} {PO}_{4} \cdot 12 {MoO}_{3} + 21 {NH}_{4} {NO}_{3} + 12 H_{2} O \\ Ammonium phosphomolybdate \\ (Yellow ppt.) \end{matrix}$