Unit 11 Alcohols, Phenols And Ethers (Intext Questions-5)
Intext Questions
11.10 Write the reactions of Williamson synthesis of 2-ethoxy-3-methylpentane starting from ethanol and 3-methylpentan-2-ol.
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11.11 Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why?
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Set (ii) is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene.
In set (i), sodium methoxide $\left({CH_3} {ONa}\right)$ is a strong nucleophile as well as a strong base. Hence, an elimination reaction predominates over a substitution reaction.
11.12 Predict the products of the following reactions:
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(i)
$ \underset{n-\text{propylmethyl ether}}{{CH_3}-{CH_2}-{CH_2}-{O}-{CH_3}}+{HBr} \longrightarrow \underset{\text{Propanol}}{{CH_3}-{CH_2}-{CH_2}-{OH}}+ \underset{\text{Bromomethane}}{{CH_3}-{Br}}$
(ii)
(iii)
(iv)
$ \underset{\text { tert -Butyl ethyl ether }}{\left({CH_3}\right) _{3} {C}-{OC _2} {H_5}} \xrightarrow{{HI}} \underset{\text { tert } \text {-Butyliodide }}{\left({CH _3}\right) _{3} {C}-{I}}+\underset{\text{Ethanol}}{{C _2} {H _5} {OH}} $
BETA
