. Write chemical equations to illustrate the following name bearing reactions
(a) Write chemical equations to illustrate the following name bearing reactions
(i) Cannizzaro’s reaction
(ii) Hell-Volhard-Zelinsky reaction
(b) Give chemical tests to distinguish between the following pairs of compounds
(i) Propanal and Propanone
(ii) Acetophenone and Benzophenone
(iii) Phenol and Benzoic acid
OR
(a) How will you bring about the following conversions:
(i) Ethanol to 3-hydroxybutanal
(ii) Benzaldehyde to Benzophenone.
(b) An organic compound A has the molecular formula C8H16O2 . It gets hydrolysed with dilute sulphuric acid and gives a carboxylic acid B and an alcohol C. Oxidation of C with chromic acid also produced B. C on dehydration reaction gives but-1-ene. Write equations for the reactions involved
Best Answer
(b) (i) Propanal and Propanone:
Tollen’s reagent test: Propanal being an aldehyde reduces Tollens reagent to silver mirror but propanone being a ketone does not
(ii) Benzophenone and Acetophenone:
Iodoform test: Acetophenone being a methyl ketone on treatment with NaOI (I2 /NaOH) gives yellow ppt of iodoform but benzophenone does not.
(iii) Phenol and Benzoic acid: FeCl3 test:
Phenol gives a violet colouration with neutral FeCl3 solution while benzoic acid gives buff coloured ppt ferric benzoate
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