Qualitative analysis of functional groups multiple choice questions

Qualitative Analysis of Functional Groups

Total marks:0 / 10

1 of 10

What is the formula of the pale yellow solid formed when propanone reacts with iodine in the presence of sodium hydroxide?

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2 of 10

Which compound reacts with 2,4-dinitrophenylhydrazine reagent but does not react with Tollens’ reagent?

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3 of 10

Structural isomerism and stereoisomerism should be considered when answering this question.

The molecular formula of compound X is C₅H₁₂O.

Compound X:

● reacts with alkaline aqueous iodine

● can be dehydrated to form two alkenes only.

What could be the identity of compound X?

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4 of 10

Which compound gives a positive test with alkaline aqueous iodine and does not show optical isomerism?

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5 of 10

Compound X, CH₃CH(OH)CH(CHO)CH₃, is heated under reflux with an excess of acidified K₂Cr₂O₇ to form compound Y.

Both X and Y are separately warmed with Fehling’s solution and the observations noted.

What are the observations?

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6 of 10

Compound X produces a carboxylic acid when heated under reflux with acidified potassium dichromate(VI). Compound X does not react with sodium metal.

What could be the identity of compound X?

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7 of 10

Alcohol Y gives product Z after mild oxidation. Z gives a positive result with Tollens’ reagent and with 2,4-dinitrophenylhydrazine reagent.

What could be the identity of alcohol Y?

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8 of 10

Which reagent cannot be used to distinguish between ethanal and propanone?

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9 of 10

A compound, Q, gives an orange precipitate with 2,4-dinitrophenylhydrazine.

Compound Q is resistant to oxidation.

On reduction, Q gives a product made up of a pair of optical isomers.

Which of the following compounds could be compound Q?

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10 of 10

Which carbonyl compound reacts with iodine in the presence of alkali to form a yellow solid?

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