Question-19 Which from following functional groups has highest priority order for naming the polyfunctional group compounds?
(A) –COCl
(B) -\mathrm{SO_3H}
(C) –CHO
(D) –OH
Answer : (B)
Explanation:
The principal functional group is decided on the basis of the following order of priority:
–COOH > –SO₃H > –COOR > –COCl > –CONH₂ > –CN > –CHO > –C=O > –OH > –NH₂ > C=C > –C≡C–