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InterviewSolution
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1. Which of the following reaction will give 1-methoxy-4-nitrobenzene. (a) 4-nitro-1-bromobenzene + sodiummethoxide. (b) 4-nitrosodium phenoxide + bromomethane |
Answer» Solution :(a) SET - (a) :  (b) Set - (b) :  Chemically both sets equally possible. In Set-1, the Br-atom is ACTIVATED by electron withdrawing effect of `-NO_2` group. Therefore nucleophilic attack by `CH_3ONa` followed by elimination of NaBr gives the desired ether.  In set-2, nucleophilic attack by 4-nitrosodium phenoxide ION on methyl bromide gives the desiredether  SINCE alkyl halides `(CH_3Br)` are more REACTIVE thanaryl halides in nucleophilic substitution reactions, therefore set-2 reactants are preferTed. |
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