Aldehydes And Ketones Test

Result

Aldehydes And Ketones Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as:

A
Cannizzaros reaction

B
Cross Cannizzaros reaction

C
Cross Aldol condensation

D
Aldol condensation

Solution

Cannizzaro, is a chemical reaction that involves the base-induced disproportionation of two molecules of a non-enolizable aldehyde to give a primary alcohol and a carboxylic acid.

Aldol condensation occurs in aldehydes/ketones having α-hydrogen with a dilute base to give β-hydroxy aldehydes called aldols.

If the condensation reaction occurs between two different aldehyde/ketone compounds it is called crossed aldol condensation.
Question 2
1 / -0

Identify compound X in the following sequence of reactions

A

B

C

D

Solution

In the first step free radical chlorination takes place and in the second step after hydrolysis the stable product benzaldehyde is formed.
Question 3
1 / -0

X is heated with soda lime and gives ethane. X is :

A
ethanoic acid

B
methanoic acid

C
propanoic acid

D
either (a) or (c)

Solution

Sodium salt of any carboxylic acid with hot soda lime undergo decarboxylation to form alkane which has one carbon atom less than the parent molecule.
Question 4
1 / -0

Which of the following does not give benzoic acid on hydrolysis ?

A
phenyl cyanide

B
benzoyl chloride

C
benzyl chloride

D
methyl benzoate

Solution

Benzyl chloride on hydrolysis gives benzyl alcohol.
Question 5
1 / -0

The reagent which does not give acid chloride on treating with a carboxylic acid is

A
PCl₅

B
Cl₂

C
SOCl₂

D
PCl₅

Solution
Question 6
1 / -0

By which reaction a ketone can be converted into hydrocarbon?

A
Aldol condensation

B
Reimer -Tiemann reaction

C
Cannizaro reaction

D
Wilf-Kishner reaction

Solution

Wolf-Kishner reaction : By this method , carbonyl group is converted to methylene group. Ketone and Aldehydes can be easily reduced to hydrocarbons by this method.
Question 7
1 / -0

When dihydroxy acetone reacts with HIO₄, the product is/are

A
HCHO

B
HCOOH

C
HCHO and HCOOH

D
HCHO and CO₂

Solution
Question 8
1 / -0

Acetaldehyde reacts with NH₃ to form

A
An acidic solution

B
A basic solution

C
A neutral solution

D
Urotropine

Solution

CH₃CHO + NH₃ → CH₃CH=NH

imine formed is basic in nature
Question 9
1 / -0

Acetone mixed with bleaching powder give

A
Chloroform

B
acetaldehyde

C
ethanol

D
phosgen

Solution
Question 10
1 / -0

Acetone reacts with Grignard reagent to form:

A
3⁰alcohol

B
2⁰ alcohol

C
ether

D
no reaction

Solution

Acetone react with grignard reagent to form 3° alcohol.