Select meta directing group of the following?
Correct answer: C. -CN
- A. -OH
- B. -NR2
- C. -CN
- D. -OR
Explanation
The correct answer is -CN. The -CN group is a meta-directing group because it withdraws electron density from the benzene ring, particularly from the ortho and para positions, reducing their reactivity to electrophilic substitution. This makes the meta position relatively more reactive. Other groups like -OH, -NR2, and -OR are electron-donating groups, thus directing substitution to 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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