Which of the following functional groups in NOT ortho para directing and activating?
Correct answer: C. COR
- A. R
- B. OH
- C. COR
- D. NH2
Explanation
The acyl group (COR) is not ortho para directing and activating. It is a deactivating group due to the presence of the carbonyl group (C=O), which withdraws electron density from the ring. As a result, the acyl group directs substitution reactions away from the ortho and para positions.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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