Aldehydes And Ketones Test

Result

Aldehydes And Ketones Test - 31

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Question 1
1 / -0

Aldehydes behave as

A
Oxidising as well as reducing agent

B
reducing agent

C
oxidising agent

D
dehydrating agent

Solution

All aldehydes are easily oxidised to respective acids and thus acts as reducing agents
Question 2
1 / -0

A compound possessing α-hydrogen atom, in the presence of dilute alkali forms β-hydroxy aldehyde. This product on crotonaldehyde. The compound us

A
CH₃CH₂CHO

B
CH₂=CH-CHO

C
HC≡C-CHO

D
CH₃CHO

Solution
Question 3
1 / -0

Wacker method involves the conversion of alkene using PdCl₂ into corresponding

A
Alcohol

B
Ketone

C
Aldehyde

D
Ether.

Solution
Question 4
1 / -0

Dialkyl cadmium reacts with a compound to form a ketone. The compound is:

A
an acid

B
an acid chloride

C
an ester

D
carbon monoxide

Solution
Question 5
1 / -0

The addition of HCN to carbonyl compounds is an example of

A
Nucleophilic substitution

B
Electrophilic addition

C
Nucleophilic addition

D
Electrophilic substitution

Solution

Carbonyl compounds undergo nucleophilic addition reaction
Question 6
1 / -0

The key step in Cannizzaro’s reaction is the intermolecular shift of

A
proton

B
hydrogen bond

C
hydronium ion

D
hydrogen band

Solution

Cannizzaro reaction
Question 7
1 / -0

Nucleophilic addition reaction will be most favoured in:

A
CH₃CH₂CH₂COCH₃

B
(CH₃)₂C = O

C
CH₃CH₂CHO

D
CH₃CHO

Solution

1. Aldehydes are most favored than ketones for Nucleophilic addition reaction. Because ketones has two +I groups which produce less positive charge on carbonyl carbon

Hence it may be C and D

2. Here comes steric hindrance and large chain, C has large chain more electron releasing and +I effect. So that D is most favored.
Question 8
1 / -0

Which of the following does not give brick red precipitate with Fehlings solution?

A
Acetaldehyde

B
Formaldehyde

C
D-glucose

D
Acetone

Solution

Since Fehling's test is basically used to test aldehyde only, ketone do not give this test due to less electrophilicity of carbonyl carbon of ketone than of aldehyde.
Question 9
1 / -0

Acetals are:

A
aldehydes

B
ketones

C
diethers

D
hydroxy aldehydes

Solution
Question 10
1 / -0

Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. Compound F is

A

B

C

D

Solution

Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E which is hexa-1,6-di-al. It on further reaction with KOH undergoes Aldol condensation to give cyclopentene-1 carbaldehyde (F).