question_answer 21)

How will you prepare the following compounds frombenzene? You may use any inorganic reagent and any organic reagenthaving not more than one carbon atom. (i) Methyl benzoate                        (ii) m-nitrobenzoic acid (iii) p-nitrobenzoic acid                  (iv) Phenyl acetic acid (v) p-nitrobenzaldehyde. The given conversions involve the following processes (i) Friedel Crafts alkylation, oxidation, esterificaticn. (ii) Introducing COOH as in (i) then nitration. (iii) Friedel Crafts alkylation; then nitration; (iv) Friedel Crafts alkylation. bromination inside chain, introducing CN in place of Br and hydrolysis. (v) Formation of p-nitrotoluene as in (iii) then oxidizing , to ,  

Answer:

(i) Benzene to methyl benzoate (ii) Benzene to m-nitrobenzoic acid     (iii) Benzene to p-nitrobenzoic acid   (iv) Benzene to phenyl acetic acid   (v) Benzene to p-nitrobenzaldehyde