What should you see when the following compounds are mixed together with the giv

Question

What should you see when the following compounds are mixed together with the given test solution? CH3CH2CH2-C-CH3 with 2,4-dinitrophenylhydrazine with Kl-I2 reagent with Tollens' reagent with 2,4-dinitrophenylhydrazine with chromic acid with Tollens' reagent 2-Pentanone and valeraldehyde (see Table 4) have close boiling points, 102 and 103degree respector Suggest a way that these two compounds could be distinguished and identified. difference of 1degree C is too close to measure experimentally.)

Explanation / Answer

a) with 2,4-dinitrophenylhydrazine gives orange red ppt

     with KI-I2 reagent and Tollen's reagent no reaction

b) with 2,4-dinitrophenylhydrazine gives orange red dye

with chromic acid gives benzoic acid with good smell

with Tollen's reagent gives silvery mirror on walls of the test tube.

     

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