ECAT Pre Engineering Chemistry Chapter 23 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 23 Aldehydes and Ketones

Try The MCQ's Test For ECAT Chemistry Chapter 23 Aldehydes and Ketones

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ECAT Chemistry Chapter 23 Aldehydes and Ketones

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Question # 1

In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction

Question # 2

The carbon of a carbonyl group is:

Question # 3

Which of the following will have the highest boiling point

Question # 4

Ketones are reduced to

Question # 5

In aldol condensation reaction, a double bond is formed between ______ and ______ carbon atoms

Question # 6

Which of the following reactions is used for detecting presence of carbonyl group?

Question # 7

Which of the following is a method of converting a unsaturated ketone into unsaturated hydrocarbon?

Question # 8

The IUPAC name fo CH3COCH (CH3)2is

Question # 9

Hydrogenation of bezoyl chloride in presence of Pd on BaSO4gives

Question # 10

Aldehydes is distinguished from ketones by using

Question # 11

Which reaction yields Bakelite?

Question # 12

Aldehydes can be distinguished from ketones by using

Question # 13

Aldehyde and small methyl ketones form crystalline ______ ppts with saturated sodium bisulphate solution

Question # 14

Distillation of calcium salts of acetic acid and formic acids gives acetaldehyde. What compound would be obtained if only calcium salt of acetic acid is distilled

Question # 15

The homologous series of aldehydes and ketones have general formula:

Question # 16

Formalin is:

Question # 17

Ketones are prepared by the oxidation of:

Question # 18

Reduction with aluminium isopropoxide in excess of Isopropyl alcohol is called Meerwein Ponndroff-Verley reduction (MPV). What will be the final product when cyclohex-2-enone is selectively reduces in MPV reaction?

Question # 19

Which of the following organic compounds exhibits positive Fehling test as well as iodoform test?

Question # 20

Condensation of aldeydes withα-hydrogen gives:

Question # 21

Chromic acid used to oxidize

Question # 22

Which of the following reagent will react with both aldehyde and ketones?

Question # 23

Wacker method involves the conversion of alkene using PdCl2into corresponding

Question # 24

The catalytic prmoter used for the industrial preparation of acetaldehyde is

Question # 25

Which alcohol may be oxidised to a product which react with 2,4-dinitorphenylhydrazine reagent but not with Fehling's reagent

Question # 26

Propyne on hydrolysis in presence of H2SO4and HgSO4gives

Question # 27

Cannizzaro reaction is not given by

Question # 28

Reaction of Grignard's reagent with ketones gives: Reaction of Grignard's reagent with formaldehyde gives:

Question # 29

Acetal is produced by reacting alcohol in the presence of dry HCl with

Question # 30

Which is not true about acetophenone?

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ECAT Chemistry Chapter 23 Important MCQ's

Sr.# Question Answer
1 Acetone is prepared by
A. Oxidation of n-propyl alcohol
B. Oxidation of acetaldehyde
C. Pyrolysis of calcium acetate
D. Pyrolysis of calcium acetate as well as acetic acid
2 A common industrial solvent is a mixture of propanone; CH3COCH3, and pentyl ethanoate CH3CO2(CH2)4CH3. Which reagent would have no effect on this solvent
A. Na(s)
B. NaBH4
C. NaOH(aq)
D. 2,4-dinitrophenylhydrazine reagent
3 For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test
A. HCHO and CH3CHO
B. CH3CHO and CH3COCH
C. CH3COCH3and C6H5COCH3
D. CH3COOH and CH3COOCH3
4 Aldehyde and small methyl ketones form crystalline ______ ppts with saturated sodium bisulphate solution
A. White
B. Red
C. Yellow
D. None of these
5 Aldehydes which do not haveα-hydrogen undergo
A. Aldol combination
B. Cannizzaro's reaction
C. Substitution
D. Elimination
6 Cannizzaro's reaction is type of reaction:
A. Self oxidation-reduction reaction
B. Disproportion reaction
C. Addition
D. A and B
7 Which of the following reagents is used to distinguish acetone and acetophenone
A. NaHSO3
B. Grinard reagent
C. Na2SO4
D. NH4Cl
8 During the mechanism of aldol condensation a/an ______ is formed
A. Oxide
B. Alkali
C. Alkoxide ion
D. None of these
9 Which of the following compounds will not give iodoform test on treatment with I2/ NaOH?
A. Acetaldehyde
B. Acetone
C. Butane
D. 3-pentanone
10 At room temperature formaldehyde is
A. Gas
B. Liquid
C. Solid
D. None of the above

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