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Give chemical tests to distinguish between the following : (a) Benzoic acid and ethyl benzoate . (b) Benzaldehyde and acetophenone . |
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Answer» Solution :(a) Benzoic ACID and ethylbenzoate `:` The two compounds can be distinguished by performing sodium bicarbonate test.Benzoic acid gives an effervescence with `NaHCO_(3)` solution while ethyl benzoate does not. `UNDERSET("Benzoic acid")(C_(6) H_(5) COOH) + NaHCO_(3) rarr underset("Sodium benzoate")(C_(6) H_(5) COONa ) + CO_(2) +H_(2) O` `underset("Ethyl benzoate")(C_(6) H_(5) COOC_(2) H_(5)) + NaHCO_(3) rarr ` NO reaction (b) Benzaldehyde and acetophenone `:` The two compounds can be distinguished by performing iodoform test. Acetophenone gives a yellow precipitate of `CHI_(3)` with NaOI or `NaOH//I_(2)` while benzaldehyde does not. `C_(6)h_(5) COCH_(3) OVERSET( NaOH //I_(2))(rarr) underset("Sodium benzoate")(C_(6)H_(5)COONa) + underset("Iodoform")(CHI_(3))` |
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