Which of the following are 3,5 (meta) directing groups when second group is induced in them:i) -NH3ii) -CHOiii) -COOHiv) -CH3
Correct answer: B. ii, iii
- A. ii, iii, iv
- B. ii, iii
- C. i, iv
- D. i, ii, iv
Explanation
The 3 5 directing groups or Meta directing groups are as follows:Aldehyde (-CHO), Ketone (-CO-), Ester (-RCOOR'), Carboxyl Group (-COOH) etc.Because the carbon in these groups is partially positive hence it withdraws the electrons.Other than them Nitro groups, Nitriles, Sulphones etc are also called meta-directing groups.
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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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