Which of the following meta-directing substituents is the most deactivating in aromatic substitution?
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:
1. | III>II>IV>I | 2. | II>III>I>IV |
3. | II>III>IV>I | 4. | III>IV>II>I |
Which one of the following is most reactive towards electrophilic attack?
1. | 2. | ||
3. | 4. |