Question # 1

On heating aldehydes with Fehling's solution we get a precipitate whose colour is

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Pink

Black

Yellow

Brick red

Which substance reacts with sodium nitroprusside.

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Ethanol

Acetaldehyde

Dimethyl ketone

Methanol

Air of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

Acetone reacts with HCN to form cyanohydrin it is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic subtitution

Industrially ethanal is prepared by air oxidation of.

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Ethane

Ethene

Ethyne

Acetic acid

Which reagent will react with both aldehyde and ketones

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Grignard reagent

Tollen's reagent

Fehling's reagent

Benedict's reagent

Paraldehyde is used as a

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Medicine

Poison

Polymer

Dye

Which one of the following compounds undergoes Cannizzaro's Reaction.

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Acetaldehyde

Benzaldehyde

Acetone

Propionaldehyde

Cannizzaro's reaction is not given by

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Formaldehyde

Acetaldehyde

Benzaldehyde

Trithylacetaldehyde

Formalin is

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

Which of the following compounds will not give iodoform test on treatment with I2/NaOH

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Acetaldehyde

Acetone

Butanone

3-Pentaneone

Aldehyde react with hydroxyl amine in acidic solution to give

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An oxime

Aldol

Polymer

Acetic acid

All of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

Which of the following reagents will reacts with both aldehydes and ketones.

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Grignard reagent

Tollens's reagent

Fehling's reagent

Benedict 's reagent

When benzaldehyde is converted to benzyl alcohol by reading with NaOH the reaction is known as.

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Cannizzaro reaction

Wurtz reaction

Wol;ficisthner reaction

Aldol reaction

The carbon atom of a carbonyl group is

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sp hybridized

sp²hybridized

sp³hybridized

none of these

Which one has yellow or orange cyrstalline ppt

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Acetone hydrazone

2, 4 DNPH

Ethanal oxime

Bisulphite addition product

An aldehyde compound can be reduced to alkane by

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Wurtz reaction

Grignard reaction

Wolf Kishner reaction

Kolbe's reaction

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