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The correct decreasing order of priority for the functional groups of organic compound in the IUPAC system of momenclature is

$ (a)\;-CONH_2,-CHO,-SO_3H, -COOH \\(b)\;-COOH,-SO_3H,-CONH_2H, -CHO \\(c)\;-SO_3H,-COOH,-CONH_2,-CHO \\(d)\;-CHO,-COOH,-SO_3H, -CONH_2 $
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The order of preference of functional groups is as follows:
$-SO_3H > -COOH > -COOR > -COX > -COCl > -CONH_2 > -CHO > -CN > > C = O > -OH > -SH > -NH_2 > C =C > -C \equiv C - > -NO_2 > -NO > -X$
So, $-SO_3H,-COOH,-CONH_2,-CHO$
Hence c is the correct answer .
answered Mar 4, 2014 by meena.p

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