Aldehydes and Ketones Test

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Aldehydes and Ketones Test - 4

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Weekly Quiz Competition

Question 1
1 / -0.25

Arrange the following compounds in decreasing order of their acid strength: i) trichloroacetic acid ii) trifluoroacetic acid iii) acetic acid and iv) formic acid

A
trifluoroacetic acid, trichloroacetic acid, formic acid and acetic acid

B
formic acid., trifluoroacetic acid, trichloroacetic acid, and acetic acid

C
trichloroacetic acid, trifluoroacetic acid, acetic acid and formic acid.

D
trifluoroacetic acid, formic acid acetic acid and Propan –1 –ol, 4 –methylphenol

Solution

Acidic strength of carboxylic acid -

– More acidic than phenols or alcohols.

– Acidity increase with the presence of a group with -I effect in the alkyl group.Whereas it decreases with the presence of +I group.

– Acidity increases with increase in the number of halogen atoms on - position.

– It decreases with increasing distance of halogen from

– It increases with increase in the electronegativity of halogen.

- CF₃ COOH >CCl₃ COOH >HCOOH >CH₃ COOH
Question 2
1 / -0.25

The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a __________ group.

A
carboxyl

B
carbonate

C
carbomate

D
carboxylate

Solution

-COOH is carboxyl group.
Question 3
1 / -0.25

CH₃ CHO and C₆ H₅ CH₂ CHO can be distinguished chemically by:

A
Benedict test

B
Iodoform test

C
Tollen 's reagent test

D
None of these

Solution

CH₃ CHO will give iodoform test and C₆ H₅ CH₂ CHO will not give iodoform test.
Question 4
1 / -0.25

The common name for pentanedioic acid is:

A
succinic acid

B
oxalic acid

C
glutaric acid

D
pimelic acid

Solution

Pentanedioic acid is glutaric acid.
Question 5
1 / -0.25

Which of the following acids does not exhibit optical isomerism?

A
Maleic acid

B
α–amino acids

C
Lactic acid

D
Tartaric acid

Solution

Maleic Acid shows Geometrical Isomerism but does not give optical isomerism.
Question 6
1 / -0.25

In the propanoate ion

A
both the carbon –oxygen bonds are the same length.

B
the carbon atom bears a –1 charge.

C
one of the oxygen atoms bears a –1 charge

D
the carbon –oxygen double bond is shorter.

Solution

This is because of Resonance.
Question 7
1 / -0.25

Aldehydes are produced on reduction of the following by DIBAL –H

A
esters

B
nitriles

C
both nitriles and esters

D
none of these

Solution

Both Nitriles and esters are reduced to Aldehyde on reaction with DIBAL-H.
Question 8
1 / -0.25

Which of the following statements is not correct?

A
Aldehydes and ketones undergo nucleophilic addition.

B
Aldehydes and ketones undergo electrophilic substitution

C
Lower members of aldehydes and ketones are soluble in water due to hydrogen bonding

D
Aldehydes and ketones contain polar carbonyl group

Solution

Aldehydes and ketones have polar C=O group. Therefore they undergo nucleophilic addition reactions.
Question 9
1 / -0.25

What compound is produced when (CH₃ )₂ CHCH₂ Br is subjected to the following sequence of steps:
1. Mg, Et₂ O
2. CO₂
3. H₃ O⁺ ?

A
3 –methylpropanoic acid

B
2 –methylpropanoic acid

C
2 –methylhexanoic acid

D
3 –methylbutanoic acid

Solution
Question 10
1 / -0.25

The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage, to give benzadehyde, The reagent used for the purpose is one of the following.

A
Chromyl chloride

B
Carbon monoxide and hydrogen chloride

C
Chlorine

D
Chromic oxide

Solution

This is Etard Reaction.
Question 11
1 / -0.25

The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage. The reaction is called?

A
Etard reaction

B
Stephen reaction

C
Friedel –crafts reaction

D
Gatterman –Koch reaction

Solution

Etard is specific reaction for conversion of toluene to Benzaldehyde.
Question 12
1 / -0.25

The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits:

A
geometrical isomerism

B
both optical and geometrical isomerism

C
optical isomerism.

D
neither optical nor geometrical isomerism

Solution

CH₃ CH=CHCHO is the product which is suitably substituted so will show geometrical isomer.
Question 13
1 / -0.25

In Hell –Volhard Zelinsky reaction, halogen reacts with

A
ketones

B
carboxylic acids

C
ethers

D
aldehydes

Solution

Alpha Hydrogen containing carboxylic acids undergo HVZ reaction.
Question 14
1 / -0.25

The following reaction is

A
Clemens reduction

B
Catalytic hydrogenation

C
Wolff –Kushner reduction

D
None of these

Solution

This is Wolff Kishner reduction of Carbonyls to alkanes.
Question 15
1 / -0.25

Many naturally occurring aldehydes and ketones are used in the blending of perfumes and flavouring agents. But the preferred ones are

A
higher ketones

B
lower aldehydes

C
lower ketones

D
higher aldehydes

Solution

Higher aldehydes are preferred.

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Aldehydes and Ketones Test - 4

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Aldehydes and Ketones Test - 4

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Question 1

trifluoroacetic acid, trichloroacetic acid, formic acid and acetic acid

formic acid., trifluoroacetic acid, trichloroacetic acid, and acetic acid

trichloroacetic acid, trifluoroacetic acid, acetic acid and formic acid.

trifluoroacetic acid, formic acid acetic acid and Propan –1 –ol, 4 –methylphenol

Solution

Question 2

carboxyl

carbonate

carbomate

carboxylate

Solution

Question 3

Benedict test

Iodoform test

Tollen 's reagent test

None of these

Solution

Question 4

succinic acid

oxalic acid

glutaric acid

pimelic acid

Solution

Question 5

Maleic acid

α–amino acids

Lactic acid

Tartaric acid

Solution

Question 6

both the carbon –oxygen bonds are the same length.

the carbon atom bears a –1 charge.

one of the oxygen atoms bears a –1 charge

the carbon –oxygen double bond is shorter.

Solution

Question 7

esters

nitriles

both nitriles and esters

none of these

Solution

Question 8

Aldehydes and ketones undergo nucleophilic addition.

Aldehydes and ketones undergo electrophilic substitution

Lower members of aldehydes and ketones are soluble in water due to hydrogen bonding

Aldehydes and ketones contain polar carbonyl group

Solution

Question 9

3 –methylpropanoic acid

2 –methylpropanoic acid

2 –methylhexanoic acid

3 –methylbutanoic acid

Solution

Question 10

Chromyl chloride

Carbon monoxide and hydrogen chloride

Chlorine

Chromic oxide

Solution

Question 11

Etard reaction

Stephen reaction

Friedel –crafts reaction

Gatterman –Koch reaction

Solution

Question 12

geometrical isomerism

both optical and geometrical isomerism

optical isomerism.

neither optical nor geometrical isomerism

Solution