MDCAT CHEMISTRY-ALDEHYDES & KETONES (SMART INSTITUTE)

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MDCAT Chemistry Quiz: Aldehydes & Ketones

Test your knowledge on aldehydes and ketones with this engaging quiz tailored for MDCAT chemistry students. Whether you aim to refresh your understanding or prepare for your exams, this quiz covers essential concepts thoroughly.

Key Features:

Multiple-choice questions
Covers structural properties, reactions, and tests
Score and review your answers instantly

60 Questions15 MinutesCreated by ExploringMolecule42

01-Symmetrical structure of ketone refers to

Uneven numbers of carbon atoms on either sides of the carbonyl groups

Same number of carbon atoms on either sides of carbonyl group

Just one carbon more on the right of the carbonyl group

Just one carbon more on the left side of the carbonyl group

02-Which of the following can be used for the oxidative preparation of aldehydes from alcohols

Pt-asbestos

Na2Cr2O7 & H2SO4

FeO & Mo2O3

All of these

03-Ethylene is oxidized to acetaldehyde on commercial scale by the use of catalyst which is

PdCl2 and CuCl2

FeO and Mo2O3

Na2Cr2O7 and H2SO4

All of these

04-The clear fact for the structural difference between aldehyde and ketone is

A ketone has one R group attached on carbonyl group

An aldehyde has two R groups attached on carbonyl group

An aldehyde has one R and and a Ketone has two R groups attached to the carbonyl groups

Both A and C

05-Formation of yellow or orange/red precipitants with two 2,4DNPH refers to the identification of

Aldehydes

Ketones

Both A and B

Pure alcohols only

06-An alcohol giving positive 2,4DNPH test implies that

It is 100% pure

It may contains some contents of aldehydes and ketones

It is ethanol

Alcohols contains some contents of carboxylic acid

07-Reduction of an aldehyde using NaBH4 gives

Primary alcohol

Tertiary alcohol

Secondary alcohol

Phenol

08-Reduction of a ketone using NaBH4 gives

Primary alcohol

Tertiary alcohol

Secondary alcohol

Phenol

09-HCN can be added to

Aldehydes

Ethers

Ketones

Both A and C

10-Addition of HCN to acetaldehyde in the presence of dilute mineral acid and sodium cyanide forms

Formaldehyde cyanohydrin

Acetone cyanohydrin

Acetaldehyde cyanohydrin

Butanone cyanohydrin

11-Acidified hydrolysis of cyanohydrins forms

Carboxylic acids

Hydroxyl-carboxylic acids

Alcohols

Aldols and Ketones

12-Haloform test is given by

Acetaldehyde

Propenone

Methyl group Ketones

All of these

13-CHX3 will be given by all the carbonyl compounds (aldehydes and ketones) containing at least one

Ethyl group

Isopropyl group

Methyl group

Both B and C

14-In the oxidation of unsymmetrical ketones using strong oxidizing agents like conc.HNO3,which carbon atom is preferentially attacked

Carbon atoms with the maximum numbers of hydrogen atoms

Carbon atoms with the least number of hydrogen atoms

Alpha carbon

Beta carbon

15-Which of the following ketones will produce propanoic acid only after oxidation by acidified potassium dichromate

Ethyl n-propyl ketone

Ethyl methyl ketone

Dimethyl ketone

Diethyl ketone

16-What will be the product in the following reaction CH3CH=CHCH2 COCH3>>>>NaBH4 ?

CH3CH2CH2CH2COCH3

CH3CH2CH2CH2CH(OH)CH3

CH3CH=CHCH2CH(OH)CH3

All of these

17-Which of the following will not form enolate ion?

CH3COCH3

CH3CHO

HCHO

All of these

18-In this compound CH2-C2OCH3 the hybridization of carbon number 1 and carbon number 2.

Sp3,sp2

Sp2,sp2

Sp2,sp3

Sp,sp2

19-Which of the following has maximum steric hindrance?

(C2H5)2CO

CH3COCH3

C3H7COCH3

CH3COH

20-Which of the following has maximum reactivity in nucleophilic addition reactions?

Formaldehyde

Acetaldehyde

Propanone

All of these

21-An aldehyde reacts with mixture to give cyanohydrin

HCl + HCN

HCl +H2SO4

NaCN +HCl

NaHSO3 + HCl

22-Formation of cyanohydrin form an aldehyde is an example of

Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

Electrophilic substitution

23-For which one of the following pairs of compounds can the members be distinguished by means of Tollen's tests

HCHO & CH3CHO

CH3CHO & CH3COCH3

CH3COCH3 & CH3COCH2CH3

CH3COOH & CH3COCH3

24-All of the following react with Fehling solution except

CH3CH2CHO

CH3CH2COCH3

HCHO

CH3CH2CH(CHO)CH3

25-Which one of the following will not give iodoform test

Ethanol

Ethanal

3-Pentanone

2-Pentanone

26-Which substance does not oxidize easily

CH3CH2CHO

CH3CHO

HCHO

CH3COCH3

27-Which one of the following set of compounds oxidize aldehydes as well as ketones

CuSO4 + NaOH +Citric acid

CuSO4 + NaOH + Tartaric acid

AgNO3 + NH4OH

K2Cr2O7 + Conc.H2SO4

28-Acetaldehydes reacts normally with

Electrophiles only

Nucleophiles only

Electrophiles and Nucleophiles

Free radicles only

29-The structural formula of the compound which is isomer of acetone is

CH3CH2CHO

CH3CH2CH2CHO

CH3CH2OH

CH3CH2CH2OH

30. 2-Pentanone and 3- Pentanone are

Metamers

Functional group isomers

Geometrical isomers

Chain isomers

31-A compound which gives both Haloform and Tollen's test is

Methanal

2-Alkanol

Methyl ketone

Acetone

32-High quality mirrors are manufactured by using

2,4 DNPH

Cupric tartrate

Cupric citrate

Diamine silver hydroxide

33-An aldehyde when boiled with Fehling solution gives brick red precipitate , red color is due to

Cuprous oxide

Cupric oxide

Sodium carboxylate

34-Reducing agent which attack carbonyl compound in NaBH4 is

H-

H+

35-Unsymmetrical ketones on oxidation with strong oxidizing agent produces----- carboxylic acids

Same

Different

Maybe same or different

Ketones cannot be oxidized

36-Strongest reducing agent among the following is

HCHO

CH3CHO

CH3COCH3

37-Benz aldehyde will not give which of the following test

Iodoform

Fehling's solution

Silver mirror

2,4 DNPH

38-Addition of which substance forms cyanohydrin compounds of aldehydes

H2O

HCN

NaCN

NaHSO3

39-Catalytic reduction of acetone will produced

Methyl alcohol

Ethyl alcohol

Isopropyl alcohol

Neopentyl alcohol

40-Which of the following is not a mild oxidizing agent

Tpllen's reagent

Fehling's solution

Benedict's solution

Acidified potassium dichromate

41-Which of the following ketone

CnH2n+2O

CnH2nO

CnH2n

CnH2n+1 O

42-For a ketone R-C=O-R, R cannot be

Same alkyl

Aryl and Alkyl

Alkyl and H

Different alkyl

43-Which of the following is unsymmetrical ketone

(CH3)2CO

C2H5OC2H5

C3H7COCH2CH2CH3

CC2H5CO(CH2)CH3

44- Which one is aldehyde

Benzaldehyde

Ethanal

Crotonaldehyde

All of these

45-Methanol converted to formaldehyde by passing alcohol from

Air

Vapours

Acid

Steam

46-Which of the following can be used in methanol formation in laboratory

47-Methanal passed over platinized asbestos converted to

Gaseous alcohol

Gaseous Methanol

Gaseous ethanol

CO2

48- ____% of formaldehyde is formalin

100

49-Mixture of air and methanol can form a compound that reacts with Fehling's solution if mixture is passed over copper heated at

500C

100C

300C

25C

50- Industrial catalyst of methanol formation from air and alcohol cannot be

51- Dichromate of which group is used in acetaldehyde formation of in laboratory

IIIA

IIA

IV A

52-Which of the following statement is incorrect about conversion of ethyl alcohol to ethanol in laboratory

Ethyl alcohol mixed with sodium dichromate

Cold dilute sulphuric acid is used

Boiling sulphuric acid is used

Reaction is very vigorous

53- Which process avoid oxidation of acetaldehyde to carboxylic acid when prepared by alcohol

Crystallization

Reduction

Evaporation

Distillation

54-Acetaldehyde is purified by which method when prepared by alcohol in laboratory

Solidification

Re-distillation

Chromatography

Steam distillation

55-Oxidation of which alcohol gives ketone

2-2Dimwthyl pentanol

2-Hydroxybutanol

2,2,Dimethyl propanol

2-Methyl,2-Butanol

56. Pi-bond of carbonyl compound is formed by overlapping of which type in C and oxygen

S-p

P-sp2

P-p

Sp2-sp2

57-Bond length of carbonyl group in aldehydes and ketones is

1.43 A

1.09 A

1.5 A

1.23A

58-State of hybridization of oxygen and geometry of carbon in carbonyl group is respectively

Sp2 and trigonal

Sp3 and trigonal

Sp2 and tetrahedral

Sp3 and tetrahedral

59-Base catalyzed reaction is carried out by strong

Electrophile

Strong Acid

Nucleophile

Heat

60-Which of the following reaction is not include in mechanism of base catalyzed nucleophilic addition reaction

(H+) + OH-Nu>>>H2O + Nu-

Nu- (OH-)>>>Nu- + H2O

Nu- +C>>>Nu-C=-(O-)

Nu-C= + (OH-)>>> (OH-) + Nu-C=-OH

MDCAT CHEMISTRY-ALDEHYDES & KETONES (SMART INSTITUTE)

MDCAT Chemistry Quiz: Aldehydes & Ketones

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