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The set of meta directing functional groups from the following sets is:

1. –NO 2 , –NH 2 , –COOH, –COOR
2. –NO 2 , –CHO, –SO 3 H, –COR
3. –CN, –NH 2 , –NHR, –OCH 3
4. –CN, –CHO, –NHCOCH 3 , –COOR

Correct answer: –NO 2 , –CHO, –SO 3 H, –COR

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