Page No 342: - Chapter 11 -Alcohols Phenols& Ethers - Intext Solutions - Ncert Solutions class 12 - Chemistry
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Question 11.10:
Write the reactions of Williamson synthesis of 2-ethoxy-3-methylpentane starting from ethanol and 3-methylpentan-2-ol.
Answer:
In Williamson synthesis, an alkyl halide reacts with an alkoxide ion. Also, it is an SN2 reaction. In the reaction, alkyl halides should be primary having the least steric hindrance. Hence, an alkyl halide is obtained from ethanol and alkoxide ion from 3-methylpentan-2-ol.
Question 11.11:
Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why?
(i)
(ii)
Answer:
Set (ii) is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene.
In set (i), sodium methoxide (CH3ONa) is a strong nucleophile as well as a strong base. Hence, an elimination reaction predominates over a substitution reaction.
