Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Explain the Fact that in Aryl Alkyl Ethers (i) The Alkoxy Group Activates the Benzene Ring Towards Electrophilic Substitution and (ii) It Directs the Incoming Substituents to Ortho and Para Positions in Benzene Ring. - Chemistry

Question

Explain the fact that in aryl alkyl ethers 

(i) The alkoxy group activates the benzene ring towards electrophilic substitution and

(ii) It directs the incoming substituents to ortho and para positions in benzene ring.

Solution 1

In aryl alkyl ethers, due to the +R effect of the alkoxy group, the electron density in the benzene ring increases as shown in the following resonance structure.

Thus, benzene is activated towards electrophilic substitution by the alkoxy group.

(ii) It can also be observed from the resonance structures that the electron density increases more at the ortho and para positions than at the meta position. As a result, the incoming substituents are directed to the ortho and para positions in the benzene ring.

Solution 2

In aryl alkyl ethers, the +R-effect of the alkoxy (OR) group increases the electron density in the benzene ring, thereby activating the benzene ring towards electrophilic substitution reaction.

Since the electron density increases more at the two ortho and one para position as compared to meta position therefore, electrophilic substitution reactions mainly occur at o-and -positions

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2018 (Latest))
Chapter 11: Alcohols, Phenols and Ethers
| 29 | Page no. 346
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Explain the Fact that in Aryl Alkyl Ethers (i) The Alkoxy Group Activates the Benzene Ring Towards Electrophilic Substitution and (ii) It Directs the Incoming Substituents to Ortho and Para Positions in Benzene Ring. Concept: Chemical Reactions of Alcohols and Phenols - Reactions Involving Cleavage of O–H Bond.
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