Question

How can the following conversions be brought about:

(i) Acetic acid to methyl cyanide.
(ii) Acetaldehyde to formaldehyde. 
(iii) Nitrobenzene to 2, 4, 6 tribromoaniline.

Answer 1

(i)

(ii)

\[\ce{\underset{\text{Acetaldehyde}}{CH3CHO} ->[(O)]\underset{\text{Acetic acid}}{CH3COOH}->[+NH3][\Delta(-H2O)]  +\underset{\text{Acetanide}}{CH3CONH2}->[Br2/KOH]\underset{\text{Formaldehyde}}{HCHO}<-[(O)]\underset{\text{Methyl alcohol}}{CH3OH}<-[NaNO2 + HCl]\underset{\text{Methylamine}}{CH3NH2}}\]

(iii)