Q.

The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is :

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$- COOH > - {CONH}_{2} > - COCl > - CHO$

$- {SO}_{3} H > - COCl > - {CONH}_{2} > - CN$

$- COOR > - COCl > - {NH}_{2} >> C = o$

$- COOH > - COOR > - {CONH}_{2} > - COCl$

answer is B.

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