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Which is correct order of priority of functional groups as per IUPAC

(1) RSO3H> RCOOR > RCOCI > RCONH2

(2) RCOOR > RCONH2 > RSO3H > RCOCI

(3) RCOOH > RCOCI > NH2 > C = O

(4) RCOOR > RSO3H > RCOCI > RCONH2

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Correct option is (1) RSO3H> RCOOR > RCOCI > RCONH2

The correct order of priority of functional groups as per IUPAC is 

RSO3H> RCOOR > RCOCI > RCONH2

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