Aldehydes And Ketones Test

Result

Aldehydes And Ketones Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Aldehydes and ketones give addition reaction with

A
Hydrazine

B
Phenyl hydrazine

C
Semicarbazide

D
Hydrogen cyanide

Solution

With hydrogen cyanide, carbonyl compounds give nucleophilic addition reaction while with hydrazine, phenyl hydrazine and semicarbazice, they give addition/ elimination reaction.
Question 2
1 / -0

C₂H₅OH and RCOOC₂H₅ can be separated from CH₃CHO using

A
Tollen's reagent

B
I₂/NaoH

C
NH₂NH₂

D
NaHSO₃

Solution

CH₃OH reacts with NaHSO₃ to form a white addition compound

C₂H₅OH and RCOOC₂H₅ do not react with NahSO₃
Question 3
1 / -0

At room temperature formaldehyde is

A
Solid

B
Liquid

C
Gas

D
None of the above

Solution

Formaldehyde is exceptionally gas at room temperature whereas other members of aldehydes and ketones are liquid at room temperature
Question 4
1 / -0

Which of the following compounds give a ketone with grignard reagent?

A
Formaldehyde

B
Ethyl alcohol

C
Methyl cyanide

D
Methyl iodide

Solution

Methyl cyanide gives a ketone with grignard reagent. For example, methylcyanide reacts with methyl magnesium bromide to form an adduct magnesium bromide propan-2-ylideneamide which on hydrolysis gives propan-2-one.
Question 5
1 / -0

Benzaldehyde react with Methyl amine to give

A
C₆H₅NH₂

B
C₆H₅CH₂NH₂

C
C₆H₅CH=NCH₃

D
C₆H₅CONH₂

Solution
Question 6
1 / -0

Ethanol vapours are passed over heated copper at 300°C and product is treated with aqueous NaOH. The final product is

A
aldol

B
β-hydroxy butyraldehyde

C
both a and b

D
none of the above

Solution
Question 7
1 / -0

Which of the following will be most readily dehydrated in acidic conditions?

A

B

C

D

Solution

β-hydroxy ketones or aldol readiy dehydration due to the presence of active methylene group
Question 8
1 / -0

Aldol condensation of aldehyde and ketones takes place through the formation of

A
free radical

B
nucleophile

C
electrophile

D
carbne

Solution
Question 9
1 / -0

Oxidation of toluene to benzaldehyde by use of chromyl chloride is called

A
Etard reaction

B
Riemer - Tiemann reaction

C
Wurtz reaction

D
Cannizzaro's

Solution

The oxidation of toluene (C₆H₅CH₃with chromyl chloride (CRO₂Cl₂) in CCl₄or CS₂ to give benzaldehyde is called Etard reaction. In this reaction, the chromyl chloride first forms a brown complex, which is seperated and then decomposed with H₂O to give benzaldehyde (C₆H₅CHO).
Question 10
1 / -0

The formula of chlorinated acetone produced in the distillation of acetone with bleaching powder is:

A
CCl₃COCH₃

B
CCl₃ COCCl₃

C
CHCl₂COCH₂Cl

D
Cl₃CCOOCH₃

Solution

The formula of chlorinated acetone produced in the distillation of acetone with bleaching powder is CCl₃COCH₃. It is also called trichloroacetic. Bleaching powder provides chlorine for the reaction.