Aldehydes, Ketones and Carboxylic Acids Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which compound is formed when benzoic acid reacts with \( \ce{SOCl2} \)?

Benzoic acid (\( \ce{C6H5COOH} \)) reacts with thionyl chloride (\( \ce{SOCl2} \)) to form benzoyl chloride (\( \ce{C6H5COCl} \)).

Benzyl chloride
Benzaldehyde
Benzoyl chloride
Benzoic anhydride
3

What is the product when propanoic acid is treated with \( \ce{SOCl2} \)?

Propanoic acid (\( \ce{CH3CH2COOH} \)) reacts with \( \ce{SOCl2} \) to form propanoyl chloride (\( \ce{CH3CH2COCl} \)).

Propanoyl chloride
Propanal
Propan-1-ol
Propyl chloride
1

Arrange in increasing order of reactivity with \( \ce{HCN} \): \( \ce{CH3CHO} \), \( \ce{CH3COCH3} \), \( \ce{C6H5CHO} \).

Reactivity with \( \ce{HCN} \) decreases with steric hindrance and increases with electrophilicity: \( \ce{CH3COCH3} \) (ketone) < \( \ce{C6H5CHO} \) (aromatic aldehyde) < \( \ce{CH3CHO} \) (aliphatic aldehyde).

\( \ce{CH3CHO} \) < \( \ce{C6H5CHO} \) < \( \ce{CH3COCH3} \)
\( \ce{C6H5CHO} \) < \( \ce{CH3CHO} \) < \( \ce{CH3COCH3} \)
\( \ce{CH3COCH3} \) < \( \ce{CH3CHO} \) < \( \ce{C6H5CHO} \)
\( \ce{CH3COCH3} \) < \( \ce{C6H5CHO} \) < \( \ce{CH3CHO} \)
4

Which ketone reacts with itself under basic conditions to form a nine-carbon β-hydroxy ketone?

Hexan-3-one (\( \ce{CH3CH2COCH2CH2CH3} \)) undergoes self-aldol condensation to form 4-hydroxy-3-propylheptan-5-one (\( \ce{CH3CH2C(OH)(CH(CH2CH3)COCH2CH3)CH2CH3} \)), a nine-carbon β-hydroxy ketone.

Pentan-2-one
Butan-2-one
Hexan-3-one
Pentan-3-one
3

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

The compound \( \ce{HCOOH} \) (methanoic acid in IUPAC) is historically known as formic acid in common nomenclature.

Acetic acid
Formic acid
Propionic acid
Butyric acid
2

What is the common name of \( \ce{CH3COCH3} \)?

The compound \( \ce{CH3COCH3} \) is a dimethyl ketone, historically named acetone in common nomenclature.

Acetone
Propanone
Methyl ketone
Ethyl ketone
1

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

Benzaldehyde (\( \ce{C6H5CHO} \)) lacks α-hydrogens, so it undergoes Cannizzaro reaction, forming benzyl alcohol (\( \ce{C6H5CH2OH} \)) and benzoate.

Benzoic acid
Benzophenone
Benzalacetone
Benzyl alcohol
4

Which compound forms a seven-carbon aldehyde via aldol condensation with ethanal?

Pentanal (\( \ce{CH3CH2CH2CH2CHO} \)) reacts with ethanal (\( \ce{CH3CHO} \)) in a cross aldol condensation, forming 2-methylhept-2-enal (\( \ce{CH3CH2CH2CH2CH=C(CH3)CHO} \)), a seven-carbon unsaturated aldehyde.

Propanal
Pentanal
Butanal
Acetone
2

Which method reduces a ketone to a methylene group?

Clemmensen reduction (Zn(Hg), HCl) converts the carbonyl group of ketones to a methylene group (\( \ce{CH2} \)), unlike other methods that produce alcohols.

Catalytic hydrogenation
Clemmensen reduction
LiAlH₄ reduction
Tollens' reagent
2

What is the product when methanal undergoes Cannizzaro reaction?

Methanal (\( \ce{HCHO} \)) lacks α-hydrogens, so it undergoes Cannizzaro reaction, forming methanol (\( \ce{CH3OH} \)) and formate ion.

Formaldehyde
Formic acid
Ethanol
Methanol
4

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