Benzene And Alkyl Benzene Result Question 6
6. The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is
(a) $ A < B < C < D $
(b) $B < C < A < D$
(c) $D < A < C < B$
(d) $D < B < A < C$
(2019 Main, 9 April I)
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Answer:
Correct Answer: 6. ( c )
Solution:
- Aromatic electrophilic substitution reactions are fast in those compounds in which the attacking site possess high electron density. Electron withdrawing groups (EWGs) reduces the electron density in the benzene ring due to its strong $-I$ effect and makes further substitution difficult. Hence, called as deactivating groups. While electron releasing groups (ERGs) increases the electron density in the benzene due to resonance. Therefore, activates the benzene ring for the attack by an electrophile. Hence, called as activating groups.
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