Aldehydes, Ketones and Carboxylic Acids Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which compound is formed when benzaldehyde reacts with hydroxylamine?

Hydroxylamine (\( \ce{NH2OH} \)) reacts with the carbonyl group of benzaldehyde (\( \ce{C6H5CHO} \)) to form benzaldoxime (\( \ce{C6H5CH=NOH} \)).

Benzyl alcohol
Benzaldoxime
Benzonitrile
Benzoic acid
2

Which compound is formed when propanal reacts with semicarbazide?

Semicarbazide reacts with the carbonyl group of propanal (\( \ce{CH3CH2CHO} \)) to form propanal semicarbazone (\( \ce{CH3CH2CH=NNHCONH2} \)).

Propanal oxime
Propanal semicarbazone
Propanoic acid
Propan-1-ol
2

What is the product when 2,2-dimethylpropanal reacts with \( \ce{NaOH} \) in the Cannizzaro reaction?

2,2-Dimethylpropanal (\( \ce{(CH3)3CCHO} \)) lacks α-hydrogens, undergoing Cannizzaro reaction to form 2,2-dimethylpropanol (\( \ce{(CH3)3CCH2OH} \)) and 2,2-dimethylpropanoate.

2-Methylpropanoic acid
2,2-Dimethylpropanal
2-Methylpropanol
2,2-Dimethylpropanol
4

Which of the following ketones does not give a positive iodoform test?

The iodoform test requires a \( \ce{CH3C=O} \) group. Pentan-3-one (\( \ce{CH3CH2COCH2CH3} \)) has no methyl ketone group, unlike the others.

Propanone
Butan-2-one
Pentan-3-one
Pentan-2-one
3

What is the structure of 4-methylpent-3-en-2-one?

The compound has a 5-carbon chain with a ketone on C-2, a double bond between C-3 and C-4, and a methyl group on C-4: \( \ce{CH3COCH=C(CH3)CH3} \).

\( \ce{CH3CH2COCH=CH2} \)
\( \ce{CH3COCH2CH=CH2} \)
\( \ce{CH3COCH=C(CH3)CH3} \)
\( \ce{CH3CH=CHCOCH3} \)
3

Which compound is formed when acetaldehyde reacts with hydroxylamine?

Acetaldehyde (\( \ce{CH3CHO} \)) reacts with hydroxylamine (\( \ce{NH2OH} \)) to form acetaldoxime (\( \ce{CH3CH=NOH} \)).

Acetone
Acetaldoxime
Acetonitrile
Ethanoic acid
2

What is the common name of \( \ce{CH3COOH} \)?

The compound \( \ce{CH3COOH} \) (ethanoic acid in IUPAC) is historically known as acetic acid in common nomenclature.

Formic acid
Acetic acid
Propionic acid
Butyric acid
2

What is the IUPAC name of \( \ce{CH3CH2COCH(C2H5)CH2CH2Cl} \)?

The longest chain with the ketone group has 6 carbons (hexan-3-one). Substituents: ethyl on C-4, chloro on C-6. Name: 4-ethyl-6-chlorohexan-3-one.

6-Chloro-4-ethylhexan-3-one
4-Ethyl-6-chlorohexan-3-one
3-Ethyl-5-chlorohexan-2-one
4-Chloro-6-ethylhexan-3-one
2

What is the product when 4-methylpentan-2-one reacts with \( \ce{NaBH4} \)?

\( \ce{NaBH4} \) reduces 4-methylpentan-2-one (\( \ce{CH3COCH2CH(CH3)2} \)) to 4-methylpentan-2-ol (\( \ce{CH3CH(OH)CH2CH(CH3)2} \)), a secondary alcohol.

4-Methylpentane
4-Methylpentan-3-ol
4-Methylpentan-2-ol
3-Methylpentan-2-ol
3

What is the product when 2-methylpropanal reacts with \( \ce{NaOH} \) in the Cannizzaro reaction?

2-Methylpropanal (\( \ce{(CH3)2CHCHO} \)) lacks α-hydrogens, so it undergoes Cannizzaro reaction, forming 2-methylpropanol (\( \ce{(CH3)2CHCH2OH} \)) and 2-methylpropanoate.

2-Methylpropanoic acid
2-Methylpropene
Isobutanal
2-Methylpropanol
4

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