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(a) Give chemical tests to distinguish b...

(a) Give chemical tests to distinguish between the following pairs of compounds:
(i) Ethanal and Propanone.
(ii) Pentan-2-one and Pentan-3-one.
(b) Arrange the following compounds in increasing order of their acid strength: Benzoic acid, 4- Nitrobenzoic acid, 3,4-Dinitrobenzoic acid,
4- Methoxybenzoic acid.

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(b) Or any other suitable test.
4-Methoxybenzoic acid `lt` Benzoic acid ` lt` 4-Nitrobenzoic acid ` lt ` 3, 4-Dinitrobenzoic acid
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