. 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

Cannizzaro Reaction

(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

    Tollens reagent

(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.

     Aceto phenone

(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

      Phenol and Benzoic acid:

     Ethanol to 3-hydroxybutanal

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