Aldehydes and Ketones Test

Result

Aldehydes and Ketones Test - 10

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Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Tollen ’s reagent used for the distinction of aldehydes with ketones is

A
Pb(NO₃ ),-NH₃ (aq)

B
Cu(NO₃ )₂ -NH₃ (aq)

C
AgNO₃ -NH₃ (aq)

D
Cu(ll) citrate-NH₃ (aq)

Solution

Tollen ’s reagent is ammoniacal solution of silver nitrate in which silver remains as [Ag(NH₃ )₂ ]⁺ .
Question 2
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A hydrocarbon X on treatment with O₃ followed by the reduction of ozonide with Zn-H₂ O gives Y. Y gives both Tollen 's test as well as yellow precipitate with NaOH/I₂ solution. Which is a possible structure of X ?

A

B

C

D

Solution

The above product has both —CHO and —COCH₃ groups required for Tolien 's test and iodoform test respectively.
Question 3
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Which compound given below does not form red precipitate with ammoniacal solution of Cu(lI) tartarate ?

A
H₂ CO

B
C₆ H₅ CHO

C
CH₃ CHO

D

Solution

Fehling 's test is not given by benzaldehyde (aromatic aldehyde).
Question 4
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Which reagent can differentiate between benzaldehyde and acetophenone?

A

B
NaOH/I₂

C

D
Both (a) and (b)

Solution

Benzaldehyde gives Tolien ’s test but acetophenone does not. On the other hand, acetophenone (Ph —COCH₃ ) gives iodoform test but benzaldehyde does not.
Question 5
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Which reagent can be used to separate a mixture of ethanol and butanone into components?

A

B

C
[Cu(NH₃ )₄ ]²⁺

D
NaOH/I₂

Solution

Butanone forms precipitate with 2, 4-dinitrophenyl hydrazine, which after separation, can be hydrolysed to obtain back the ketone.
Question 6
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Reagent that can differentiate 2-propanoi from acetone is

A
NaOH/I₂

B

C
Ce(NO₃ )₄

D
[Cu(NH₃ )₄ ]²⁺

Solution

Cerric nitrate forms coloured solution with alcohols but does not react with ketone.
Question 7
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Which reagent given below can differentiate propanal from propanone?

A
Schiffs reagent

B
NaHSO₃

C
2, 4-dinitrophenyl hydrazine

D
NaCN/HCN

Solution

Schiff`s test is given by aldehydes but not by ketones
Question 8
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Which of the following would produce an orange coloured precipitate with 2, 4-dinitrophenyl hydrazine?

A

B

C
CH₃ CHO

D

Solution

Conjugated aldehydes and ketones form orange coloured precipitate with 2, 4-dinitrophenyl hydrazine. Non-conjugated carbonyls form yellow precipitate in the same reaction.
Question 9
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One or More than One Options Correct Type

Direction : This section contains multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. Which of the following form(s) yellow precipitate with NaOH/I₂ solution?

A
CH₃ CHO

B

C

D
All are correct

Solution

Carbonyls with group or an alcohol with a methyl group and a “H ”at α-carbon gives iodoform test.
Question 10
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Which of the following compounds reduce(s) ammoniacal silver nitrate solution?

A
CH₃ CH₂ CHO

B

C
C₆ H₅ CHO

D
All are correct

Solution

Both aliphatic aldehydes and aromatic aldehydes give Tolien ’s test. Besides, α-hydroxy ketones are also oxidised by Tollen ’s reagent.