1. Tardigrade
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  3. Chemistry
  4. Among the following groups the ortho and para directing group is :

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Q. Among the following groups the ortho and para directing group is :

AFMCAFMC 2003

Solution:

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$2$ and $6$ are ortho position $4$ is para position $3$ and $5$ are meta position with respect to the substituent - $X$.
Aromatic compounds undergo eiectrophilic substitution reaction.
Those groups which increase the electron density on ortho, para position
$\left(v i z,- CH _{3},- C _{2} H _{5}\right.,- OH, - Br, - NH _{2}, - NH$ R etc.)
are called ortho/para directing group substituents, which increases electron density on meta position ($- NO _{2},- CN ,- CHO ,- COR.- COOH ,- COO R,- SO _{3} H$ etc.) are meta directing groups.