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  4. Aldehydes, Ketones and Carboxylic Acids Chapter-Wise Test 3

Aldehydes, Ketones and Carboxylic Acids Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which carboxylic acid has the highest solubility in water among the following?

Solubility decreases with chain length due to hydrophobic effects. Methanoic acid (\( \ce{HCOOH} \)) has the shortest chain and highest solubility.

Ethanoic acid
Methanoic acid
Propanoic acid
Butanoic acid
2

Which compound is formed when propanone reacts with 2,4-dinitrophenylhydrazine?

2,4-DNP reacts with the carbonyl group of propanone (\( \ce{CH3COCH3} \)) to form its 2,4-dinitrophenylhydrazone, a yellow-orange precipitate.

Propan-2-ol
Propanal
Propanone oxime
Propanone 2,4-dinitrophenylhydrazone
4

Which compound does not undergo the iodoform test?

The iodoform test requires a \( \ce{CH3C=O} \) group. Benzaldehyde (\( \ce{C6H5CHO} \)) lacks this group and does not give a positive result.

Acetone
Benzaldehyde
Ethanal
Butan-2-one
2

Which compound gives a positive Schiff’s test but not Fehling’s test?

Benzaldehyde (\( \ce{C6H5CHO} \)) restores the pink color in Schiff’s test (aldehydes) but does not reduce Fehling’s solution (aromatic aldehydes are less reactive).

Acetone
Ethanal
Propanone
Benzaldehyde
4

Which of the following does not undergo Cannizzaro reaction?

Cannizzaro reaction occurs with aldehydes lacking α-hydrogens. Propanal (\( \ce{CH3CH2CHO} \)) has α-hydrogens and undergoes aldol condensation instead.

Methanal
Benzaldehyde
Propanal
2-Methylpropanal
3

Which reaction converts ethanal to ethanol?

Reduction of ethanal (\( \ce{CH3CHO} \)) with \( \ce{NaBH4} \) yields ethanol (\( \ce{CH3CH2OH} \)).

Oxidation with \( \ce{KMnO4} \)
Aldol condensation
Clemmensen reduction
Reduction with \( \ce{NaBH4} \)
4

Which test produces a pink color with butanal but not with butan-2-one?

Schiff’s test restores a pink color with aldehydes like butanal (\( \ce{CH3CH2CH2CHO} \)), but not with ketones like butan-2-one (\( \ce{CH3COCH2CH3} \)).

Iodoform test
Schiff’s test
Fehling’s test
2,4-DNP test
2

Which compound forms a six-carbon tertiary alcohol when treated with \( \ce{CH3CH2CH2MgBr} \)?

Propanone (\( \ce{CH3COCH3} \)) reacts with \( \ce{CH3CH2CH2MgBr} \), adding a propyl group, forming 2-methylpentan-2-ol (\( \ce{CH3C(OH)(CH2CH2CH3)CH3} \)), a six-carbon tertiary alcohol.

Ethanal
Propanone
Propanal
Butanal
2

Which compound shows a positive iodoform test and forms a tertiary alcohol with \( \ce{CH3MgBr} \)?

Acetone (\( \ce{CH3COCH3} \)) gives a positive iodoform test (\( \ce{CH3C=O} \)) and reacts with \( \ce{CH3MgBr} \) to form 2-methylpropan-2-ol (\( \ce{(CH3)3COH} \)), a tertiary alcohol.

Propanal
Acetone
Benzaldehyde
Pentan-3-one
2

Which test gives a yellow precipitate with both acetaldehyde and acetone?

The iodoform test (\( \ce{I2, NaOH} \)) is positive for compounds with \( \ce{CH3C=O} \), like acetaldehyde (\( \ce{CH3CHO} \)) and acetone (\( \ce{CH3COCH3} \)), forming \( \ce{CHI3} \).

Tollens' test
Iodoform test
Fehling’s test
Schiff’s test
2

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