How can the following conversions be brought about:   

(i) Nitro benzene to benzene diazonium chloride.

(ii) Propanoic acid to ethylamine.

(iii) Benzoic acid to benzaldehyde

Identify the compounds A, B, C, D, E, and F:

 Write balanced chemical equations for the following reactions: 

(i) Oxalic acid is treated with acidified potassium permanganate solution.

(ii) Benzoic acid is treated with a mixture of concentrated nitric acid and concentrated sulphuric acid.

(iii) Methyl magnesium iodide is treated with carbon dioxide and the product hydrolysed in acidic medium.

(iii) Ethylacetate is treated with ammonia.

An organic compound [A] having molecular formula C₂H₇N on treatment with nitrous acid gives a compound [B] having molecular formula C₂H₆O. [B] on treatment with an organic compound [C] gives a carboxylic acid [D] and a sweet smelling compound [E]. Oxidation of [B] with acidified potassium dichromate also gives [D].

(i) Identify [A], [B], [C], [D] and [E],

(ii) Write balanced chemical equation of [D] with chlorine is the presence of red phosphorus and name the reaction. compounds relevant to these isomers.