Aldehydes And Ketones Test

Result

Aldehydes And Ketones Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a mixed ketone

A
Pentanone

B
Acetophenone

C
Benzophenone

D
Butanone

Solution

Mixed ketones are the complex ketones in which both the groups are not same. i.e one is alkyl and another is aromatic.
Question 2
1 / -0

In the cannizzaro reaction given below

the slowest step is:

A
the attack of at the carbonyl group

B
the transfer of hydride ion to the carbonyl group

C
the abstraction of a proton from the carboxylic acid

D
the deprotonation of Ph−CH₂ OH

Solution

Hydride ion transfer to the carbonyl group is the slowest or the rate determining step.
Question 3
1 / -0

Which of the following reactants in presence of AlCl₃ give acetophenone ?

A
Benzene and Acetone

B
Phenol and Acetone

C
Phenol and AcOH

D
Benzene and AcCl⋅

Solution
Question 4
1 / -0

Which of the following react with NaOH to produce an acid and an alcohol ?

A
HCHO

B
CH₃COOH

C
CH₃CH₂COOH

D
C₆H₅COOH

Solution
Question 5
1 / -0

Which of the following reactions is a condensation reaction?

A
HCHO ⟶ Paraformaldehyde

B
CH₃CHO⟶ Paraldehyde

C
CH₃COCH₃→ Mesityl oxide

D
H₂C=CH₂⟶Polyethylene

Solution
Question 6
1 / -0

3HCHO(aq) ⇋ X, X is ... ....

A
Formalin

B
Paraformaldehyde

C
Paraldehyde

D
Metaformaldehyde

Solution
Question 7
1 / -0

Which of the following statement about bezaldehyde is not true

A
Forms an addition compound with sodium hydrogen sulphate

B
Undergoes Aldol condensation

C
Reduces Tollen's reagent

D
Undergoes Cannizzaro's reaction

Solution

Benzaldehyde does not have any α-hydrogen thus does not undergo aldol condensation
Question 8
1 / -0

A substance C₄H₁₀O on oxidation yields a compound C₄H₈O which gives an oxime and a positive idoform test. The original substance on treatment with conc. H₂SO₄ gives C₄H₈. The structure of the compound is

A
CH₃CH₂CH₂CH₂OH

B
CH₃CH(HO)CH₂CH₃

C
(CH₃)₃COH

D
CH₃CH₂−O−CH₂CH₃

Solution

Butanone gives both an oxime and positive iodoform test, therefore, the original compound is 2- butanol.
Question 9
1 / -0

The reagent with which both aldehyde and acetone react easily is

A
Fehling's reagent

B
Grignard reagent

C
Schiff's reagent

D
Tollen's reagent

Solution
Question 10
1 / -0

Silver mirror is a test for

A
Aldehydes

B
Thio alcohols

C
Amines

D
Ethers

Solution

Silver mirror test is used to distinguish aldehydes from ketones. Aldehydes give a positive silver mirror test. Ketones do not give this test. In this test, Tollen's reagent is used which is an ammoniacal silver nitrate solution. It acts as a mild oxidising agent and oxidizes aldehyde to acetate ion. Silver ion is reduced to metallic silver. This forms a bright silver mirror on the inner side of the container or it forms grayish-black precipitate.