Aldehydes, Ketones and Carboxylic Acids Test 2

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Aldehydes, Ketones and Carboxylic Acids Test 2

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-12) This section contains 12 multiple choice questions. 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 C₅H₁₂O(X). X on oxidation with CrO₃/H₂SO₄ gives an achiral C₅H₁₀O. 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)₃CO}₃AIH] at -80°C

C
Na/C₂H₅OH

D
[HAI {CH₂CH(CH₃)₂}₂] at - 80°C

Solution

Na /C₂ H₅OH 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)₄H] 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)₃CO]₃AI/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(C₇H₁₂) on ozonolysis followed by the treatment with (CH₃)₂S gives C₇H₁₂O₂ 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 CH₃CO— group.
Question 9
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A hydrocarbon X has molecular formula C₅H₁₀ X on treatment with B₂H₆ in H₂O₂ /NaOH gives an optically active C₅H₁₂O which on treatment with CrO₃/HCI / pyridine gives C₅H₁₀O 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
Question 11
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Consider the following reaction,
(A pure enantiomer)
Q.
The incorrect statement regarding X is

A
It is an aldehyde

B
Product has inverted configuration at the α-carbon

C
X is a racemic mixture

D
Product can be either laevorotatory or dextrorotatory isomer

Solution

X will be a pure enantiomer of aldehyde.
Question 12
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Consider the following reaction sequence,
Q.
The correct statement regarding X is

A
It has an aldehyde functional group

B
It has a ketone functional group

C
It has both aldehyde and ketone functional groups

D
It has a ketone and an acid functional group

Solution