The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
– CONH2 , – CHO, – SO3H , – COOH
– COOH , – SO3H , – CONH2 , – CHO
– SO3H , – COOH , – CONH2 , – CHO
– CHO , – COOH ,– SO3H , – CONH2
As we learnt in
Seniority Table -
- wherein
Carboxylic acid is the senior most functional group.
The priority order of functional groups are
– COOH – SO3H – CONH2 – CHO
Correct option is 2.
Option 1)
– CONH2 , – CHO, – SO3H , – COOH
This option is incorrect
Option 2)
– COOH , – SO3H , – CONH2 , – CHO
This option is correct
Option 3)
– SO3H , – COOH , – CONH2 , – CHO
This option is incorrect
Option 4)
– CHO , – COOH ,– SO3H , – CONH2
This option is incorrect
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