Aldehydes, Ketones and Carboxylic Acids Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Arrange in increasing order of boiling points: Ethanal, Ethanol, Acetone.

Boiling points depend on intermolecular forces: Acetone (weak dipole-dipole) < Ethanal (stronger dipole-dipole) < Ethanol (H-bonding).

Ethanol < Ethanal < Acetone
Ethanal < Acetone < Ethanol
Acetone < Ethanol < Ethanal
Acetone < Ethanal < Ethanol
3

Which compound forms a six-carbon ketone when its calcium salt is heated?

Calcium butanoate (\( \ce{(CH3CH2CH2COO)2Ca} \)) from butanoic acid (\( \ce{CH3CH2CH2COOH} \)) decarboxylates to form heptan-4-one (\( \ce{CH3CH2CH2COCH2CH2CH3} \)), a six-carbon ketone.

Propanoic acid
Butanoic acid
Ethanoic acid
Pentanoic acid
2

Which of the following aldehydes gives a positive iodoform test?

The iodoform test is positive for compounds with a \( \ce{CH3CH(OH)-} \) or \( \ce{CH3C=O} \) group. Ethanal (\( \ce{CH3CHO} \)) forms \( \ce{CH3CH(OH)I} \) with iodine and base, giving a yellow precipitate.

Ethanal
Methanal
Benzaldehyde
Prop-2-enal
1

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

Butanal (\( \ce{CH3CH2CH2CHO} \)) is an aliphatic aldehyde (positive Fehling’s test) but lacks a \( \ce{CH3C=O} \) group (negative iodoform test).

Acetone
Ethanal
Pentan-2-one
Butanal
4

What is the product when acetophenone is oxidized with \( \ce{SeO2} \)?

\( \ce{SeO2} \) oxidizes the α-carbon of ketones. Acetophenone (\( \ce{C6H5COCH3} \)) forms phenylglyoxal (\( \ce{C6H5COCHO} \)).

Benzoic acid
Benzaldehyde
Phenylglyoxal
Acetophenone oxide
3

Which method is used to prepare ketones from carboxylic acids?

Heating calcium salts of carboxylic acids (e.g., calcium acetate) decarboxylates them to form ketones like acetone (\( \ce{CH3COCH3} \)).

Rosenmund reduction
Heating calcium salt of carboxylic acid
Ozonolysis
Clemmensen reduction
2

What is the product when ethanoic acid is heated with calcium hydroxide?

Heating the calcium salt of ethanoic acid (\( \ce{(CH3COO)2Ca} \)) decarboxylates it to form acetone (\( \ce{CH3COCH3} \)).

Acetone
Ethanal
Ethanol
Methane
1

What is the IUPAC name of \( \ce{CH3CH2CH(CHO)CH3} \)?

The longest chain with the aldehyde group has 4 carbons (butanal), with a methyl group on C-2: 2-methylbutanal.

2-Methylbutanal
3-Methylbutanal
2-Methylpentanal
Pentan-2-one
1

What is the common name of \( \ce{CH3CH2COOH} \)?

The compound \( \ce{CH3CH2COOH} \) (propanoic acid in IUPAC) is historically called propionic acid in common nomenclature.

Acetic acid
Propionic acid
Butyric acid
Formic acid
2

Which test gives a yellow precipitate with butan-2-one?

The iodoform test (\( \ce{I2, NaOH} \)) is positive for compounds with a \( \ce{CH3C=O} \) group, like butan-2-one (\( \ce{CH3COCH2CH3} \)), forming \( \ce{CHI3} \).

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

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