A sodium salt gives a fruity smell on warming with ethanol and concentrated H2SO4 and a deep red colour with neutral FeCl3. Assuming the acid is liberated by H2SO4, 2CH3COONa + H2SO4 -> 2CH3COOH + Na2SO4, and esterified completely with ethanol, CH3COOH + C2H5OH -> CH3COOC2H5 + H2O, the mass of ester obtainable from 0.82 g of the salt is (C 12, H 1, O 16, Na 23)

JEE Advanced levelSingle correct optionDifficulty 3 of 3qa110

A sodium salt gives a fruity smell on warming with ethanol and concentrated $H X_{2} SO X_{4}$ and a deep red colour with neutral $FeCl X_{3}$ . Assuming the acid is liberated by $H X_{2} SO X_{4}$ , $2 CH X_{3} COONa + H X_{2} SO X_{4} 2 CH X_{3} COOH + Na X_{2} SO X_{4}$ , and esterified completely with ethanol, $CH X_{3} COOH + C X_{2} H X_{5} OH CH X_{3} COOC X_{2} H X_{5} + H X_{2} O$ , the mass of ester obtainable from $0.82 g$ of the salt is (C 12, H 1, O 16, Na 23)

The ester smell and the red iron(III) colour show the salt is sodium acetate (

M = 82

). Moles

= 0.82/82 = 0.0100

giving

0.0100 mol

acetic acid (1:1), and 1:1 esterification gives

0.0100 mol

ethyl acetate (

M = 88

). Mass

= 0.88 g