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

Choose an answer

Nucleophilic substitution

Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Formaldehyde is used to make

Choose an answer

Plastics

Medicine

Antiseptic

All of these

Acetone reacts with HCN to form a cyanohydrin. It is an example of:

Choose an answer

Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Cannizzzaro's reaction is not given by:

Choose an answer

Formaldehyde

Acetaldehyde

Benzaldehyde

Trimethyl

Carboxyl compounds have functional group:

Choose an answer

R-C-X

R-CH=O

RCOR

All

Aldehydes are reduced to :

Choose an answer

Pri-alcohol

Sec-alcohol

Ter-alcohol

All of these

An organic compound 'A' has the molecular formula C₃H₆O, it undergoes iodoform test. When saturated with HCl it gives 'B' of molecular formula C₉H₁₄O. A and B, respectively are

Choose an answer

Propanal and mesitylene

Propanone and mesityl oxide

Propanone and 2, 6-dimethyl-2,5-heptadien-4-one

Propanone and mesitylene oxide

For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test

Choose an answer

HCHO and CH₃CHO

CH₃CHO and CH₃COCH

CH₃COCH₃and C₆H₅COCH₃

CH₃COOH and CH₃COOCH₃

Isopropyl alcohol on oxidation forms

Choose an answer

Acetone

Ether

Ethylene

Acetaldehyde

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

Choose an answer

CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

Which compound would undergo nucleophilic addition

Choose an answer

Ethene, C₂H₄

Bromoethane, C₂H₅Br

Ethanal, CH₃CHO

Ethane, C₂H₆

Choose an answer

2-chlorobutanal

alfa-chlorobutanal

2-chlorobutyraldehyde

alfa- chlorobutyraldehyde

The carbon atom of a carbonyl group is

Choose an answer

Sp hybridized

Sp²hybridized

Sp³hybridized

None of these

When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is

Choose an answer

Propane

Propylene

Acetaldehyde

Acetone

Chromyl chloride and toluene react to produce

Choose an answer

p-chlorotoluene

Benzaldehyde

Benzyl chloride

Bezoic acid

The product of the reaction between propanone and HCN is hydrolysed under acidic conditions. What is the formula of the final product

Choose an answer

CH₃CH(OH)COOH

CH₃CH₂CH(OH)COOH

(CH₃)₂C(OH)COOH

CH₃CH₂CH₂COOH

Which one of the following statement is wrong regarding differences between aldehydes and ketones

Choose an answer

Aldehydes undergo reduction to form primary alcohols while ketones undergo reduction to form secondary alcohols

Aldehydes undergo oxidation to form acids having less number of carbon atoms while ketones undergo oxidation to form acids having same number of carbon atoms

Aldehydes give positive silver mirror test while ketones give negative -mirror test

Aldehydes can undergo polymerization while ketones cannot undergo polymerizarion

The base used in Cannizzaro's reaction is

Choose an answer

NaOH

KOH

CHI₃

All of these

Which of the following is halo form

Choose an answer

CHBr₃

CHCI₃

CHI₃

All of these

Wolf-kishner reduction is used for the reduction of

Choose an answer

Nitro compounds

Carboxylic acids

Carbonyl compounds

Olefins

Which of the following will have the highest boiling point

Choose an answer

Methanol

Ethanol

Propanal

2-hexanone

Which of the following compounds gives a ketone with Grignard's reagent?

Choose an answer

Formaldehyde

Ethanenitrile

Ethyl alcohol

Methyl iodide

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

Choose an answer

White

Red

Yellow

None of these

Hydroxyl amine is a derivative of::

Choose an answer

Alcohol

Aldehyde

Ammonia

Ketone

Formalin is:

Choose an answer

10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

During the mechanism of aldol condensation a/an ______ is formed

Choose an answer

Oxide

Alkali

Alkoxide ion

None of these

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

Choose an answer

Acetaldehyde

Ketone

Ether

Carboxylic acid

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

Choose an answer

Butan-1-ol

Butan-2-ol

2-methylpropan-1-ol

2-methylpropan-2-ol

Silver mirror test is applied for

Choose an answer

Aldehydes

Alcohols

Acids

Esters

In formadaldehyde and KOH are heated then we get

Choose an answer

Acetylene

Methane

Methyl alcohol

Ethyl formate

Aldehydes can be distinguished from ketones by

Choose an answer

2,4-DNPH test

NaHSO₃test

N₂H₄test

Tollen's test

More Classes

Other Links

ECAT Chemistry Chapter 23 Aldehydes and Ketones Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer