Some meta-directing substituents in aromatic substitution are given.
Most deactivating group among the following is: 

1. –SO₃H

2. –COOH

3. –NO₂

4. –C≡N

Among cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV) the correct order of decreasing acidic character will be:

Which one of the following is most reactive towards electrophilic attack?
 

1.		2.
3.		4.