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Aldehydes, Ketones and Acids contain Plus Two Chemistry Chapter Wise Previous Questions Chapter 12 Aldehydes, Ketones and Carboxylic Acids 42
a) Name the product obtained by the reaction between Acetic acid and Ethanol.

b) a) Give any Iwo tests to distinguish between aldehydes and ketones.

ii) Two chemical reactions are given below:

1) Identify the products of each reaction.

2) Give the name of each reaction.

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a) Acetic acid reacts with ethanol in presence of mineral acids such as concentrated H2SO4 as catalyst to form the ester ethyl acetate or ethyl ethanoate (CH3COOC2H. This reaion is known as esterification.

b) i) 1) Tollens test (Silver mirror test) – on warming an aldehyde with freshly prepared am moniacal silver nitrate solution (Tollens’ reagent) a bright silver mirror is produced due to the formation of silver metal. Here the aldehydes are oxidised to the corresponding carboxylate anion while they reduce Ag to metallic silver.

2) Fehling’s Test – on heating an aldehyde with Fehlings reagent (mbdure of aqueous copper sulphate and alkaline sodium potassium tartarate), a reddish brown precipi tate is obtained. Here aldehydes are oxidised to the corresponding carboxylate anion while they reduce Cu2+ to Cu2O.

Since ketones are less reactive than aldehydes they will not answer these two tests.

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