Which one of the following is correct order ?
| A. |
—OH > —OR (order of –I effect) |
| B. |
`—CH_3 > —CO_3 > C C l_3` (order of +I effect) |
| C. |
`—F > —OH > —NH_2` (order of –I effect) |
 |
| D. |
`—NO — SO_2R—SO_3H—NO_2` (set of meta directors) |
Problem is based on concept of inductive effect and electronegativity of element. As F is most electronegative element with smallest size rather than —OH and —`NH_2` where O and N has larger size as well as lower electronegative than F. —F —OH —`NH_2` Electronegativity decreases `->`inductive effect decreases
`->`Hence, correct order is (c) While all other are conceptually very wrong