(a) Write the product(s) in the following reactions : (i) (iii) CH_(3)-CH=CH-CN overset("(a) DIBAL - H")underset("(b) "H_(2)O)rarr? (b) Give simple chemical tests to distinguish between the following pairs of compounds: (i) Butanal and Butan-2-one (ii) Benzoic acid and Phenol Or (a) Write the reactions involved in the following : (i) Etard reaction (ii) Stephen reduction (b) How will you convert the following in not more than two steps: (i) Benzoic acid to Benzaldehyde (ii) Acetophenone to Benzoic acid (iii) Ethanoic acid to 2-Hydroxyethanoic acid

(a) Write the product(s) in the following reactions : (i) (iii) CH_

1.	(a) Write the product(s) in the following reactions : (i) (iii) CH_(3)-CH=CH-CN overset("(a) DIBAL - H")underset("(b) "H_(2)O)rarr? (b) Give simple chemical tests to distinguish between the following pairs of compounds: (i) Butanal and Butan-2-one (ii) Benzoic acid and Phenol Or (a) Write the reactions involved in the following : (i) Etard reaction (ii) Stephen reduction (b) How will you convert the following in not more than two steps: (i) Benzoic acid to Benzaldehyde (ii) Acetophenone to Benzoic acid (iii) Ethanoic acid to 2-Hydroxyethanoic acid
Answer» Solution :(i) (III) `CH_(3)-CH=CH-CHO` (b) (i) Tollen.s reagent test : Add ammoniacal solution of silver NITRATE (Tollen.s Reagent) in both the solutions. Butanal GIVES silver mirror whereas Butan-2-one does not. (ii) Add neutral `FeCl_(3)` in both the solutions, phenol forms violet colour but benzoic acid does not. (a)(i) (ii) Stephen reaction `RCN+SnCl_(2)+HCl rarr RCH = NH overset(H_(3)O^(+))rarr RCHO` Or `RCN overset("(i) "SnCl2+HCl)underset((ii)H_(3)O^(+))rarrRCHO` (b) (i)`RCNoverset((i) SnCl2+HCl)underset((ii)H_(3)O^(+))rarr RCHO` (ii)