Aldehydes and Ketones Test

Result

Aldehydes and Ketones Test - 5

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type

Direction : Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q.

An optically active organic compound has molecular formula C₅ H₁₂ O(X). X on oxidation with CrO₃ /H₂ SO₄ gives an achiral C₅ H₁₀ O. Hence, X could be

A

B

C

D

Solution

Oxidation of X giving ketone as well as X is chiral, it must be a secondary alcohol with a-chiral carbon.
Question 2
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Which of the following reaction will not produce an aldehyde?

A

B

C

D

Solution

Anti vicinal-diols do not undergo oxidative cleavage with HIO₄ .
Question 3
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Which reagent below cannot reduce an acid chloride to an aldehyde?

A
Pd/BaSO₄

B
Li[{(CH₃ )₃ CO}₃ AIH] at -80 °C

C
Na/C₂ H₅ OH

D
[HAI {CH₂ CH(CH₃ )₂ }₂ ] at - 80 °C

Solution

Na /C₂ H₅ OH further reduces aldehydes to alcohols.
Question 4
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The incorrect statement regarding oxo process for synthesis of an aldehyde is

A
Mixture of CO and H₂ is allowed to react with an alkene

B
Co₂ (CO)₈ may be used as a catalyst

C
[Co(CO)₄ H] may act as a catalyst

D
This process can also be used in the same manner for the synthesis of ketone

Solution

In an oxo process, formylation (addition of H and CHO) of double bond takes place, hence ketones cannot be synthesised in direct oxo process.
Question 5
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All of the following reaction gives atleast one ketone as a significant organic product except

A

B

C

D

Solution

It gives aldehydes as major product.
Question 6
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All of the following results in the formation of an aldehyde except

A

B

C

D

Solution

It gives a ketone.
Question 7
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Consider the following reaction,
All of the following reagents can bring about the above transformation except

A
MnO₂

B
[(CH₃ )₃ CO]₃ AI/Acetone

C
CrO₃ /Pyridine/HC

D
KMnO₄ /OH^-

Solution

Alkaline permanganate (Baeyer ’s reagent) also oxidises olefinic bonds to syn vicinal-diols.
Question 8
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A hydrocarbon X(C₇ H₁₂ ) on ozonolysis followed by the treatment with (CH₃ )₂ S gives C₇ H₁₂ O₂ which gives positive Tollen ’s test as well as positive iodoform test. The compoppd below satisfying the criteria of X is

A

B

C

D

Solution

The ozonolysis product of X is a dicarbonyl which contains both aldehyde group and CH₃ CO —group.
Question 9
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A hydrocarbon X has molecular formula C₅ H₁₀ X on treatment with B₂ H₆ in H₂ O₂ /NaOH gives an optically active C₅ H₁₂ O which on treatment with CrO₃ /HCI / pyridine gives C₅ H₁₀ O which is still chiral. Which of the following can be a product of reductive ozonolysis of X?

A

B

C

D

Solution
Question 10
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What is the final major product of the following reaction

A

B

C

D

Solution