CH _3 CHO and C _6 H _5 CH _2 CHO can be distinguished chemically by

NEET 2012 Chemistry question

and can be distinguished chemically by

(1)Fehling solution test
(2)Benedict test
(3)Iodoform testCorrect
(4)Tollen's reagent test

Answer: (3)

Solution

Both compounds are aliphatic aldehydes (acetaldehyde and phenylacetaldehyde), so both reduce Fehling's solution, Benedict's solution and Tollens' reagent; tests (1), (2) and (4) cannot separate them. Only acetaldehyde has the group (a methyl ketone-type unit) and therefore gives the iodoform

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Question ID VK-091095