laboursonline – MCQs, Mock Tests | IIT JEE IIT JEE Aldehydes And Ketones

Aromatic aldehydes react with primary amines to form

1. Amino acids
2. Schiffs base
3. Pyrosole
4. Pyridine.

✅ Correct Answer: 2

On heating a mixture of calcium formate and calcium propanoate??is obtained

1. propanal
2. butanone
3. propane
4. propanoic acid

✅ Correct Answer: 1

Which of the following does not reduce Fehling?s solution?

1. Formaldehyde
2. Paraldehyde
3. Propanal
4. Acetaldehyde

✅ Correct Answer: 2

Acetaldehyde when treated with ethyl alcohol in the presence of dil HCl gives

1. formaldehyde
2. crotonaldehyde
3. propanal
4. acetal

✅ Correct Answer: 4

Calcium formate of heating gives

1. formic acid
2. banzaldehyde
3. methanoic
4. anhydrideformaldehyde

✅ Correct Answer: 4

Calcium acetate on heating gives

1. ethane
2. pentane
3. acetic anhydride
4. acetone

✅ Correct Answer: 4

Which of the following does not have alpha hydrogen?

1. Formaldehyde
2. Acetone
3. Benzaldehyde
4. Phenyl acetaldehyde

✅ Correct Answer: 1

Shape of the carboxyl group is

1. tetrahedral
2. pyramidal
3. planar triangular
4. octahedral

✅ Correct Answer: 3

Which of the following is used in medicine as a hypnotic?

1. Paraformaldehyde
2. Acetaldehyde
3. Methaldehyde
4. Paraldehyde

✅ Correct Answer: 4

Which of the following is a sedative?

1. Paraformaldehyde
2. Benzaldehyde
3. Metaldehyde
4. Paraldehyde

✅ Correct Answer: 4

Calcium salt of propionic acid is distilled in dry conditions. The product formed will show

1. Fehling test positive
2. Iodoform test negative
3. Victor Meyer test positive
4. Tollens test positive.

✅ Correct Answer: 2

Which of the following can reduce Tollens reagent but no Fehlings soln.?

1. Benzaldehyde
2. Acetaldehyde
3. Formaldehyde
4. Acetone

✅ Correct Answer: 2

IUPAC name of crotanaldehyde is

1. 2 methyl propanol
2. isobutynaldehyde
3. 2 Butanal
4. 1 Butanal

✅ Correct Answer: 2

Etards reaction involves the preparation of benzaldehyde from

1. Toluene
2. Ethyl benzene
3. Benzoyl chloride
4. Sodium benzoate.

✅ Correct Answer: 1

Oxidation of secondary alcohol to ketone with aluminium tert. butanide is known as

1. Meerwein Pondorff Verley reaction
2. Oppenauer oxidation
3. Kolbes reaction
4. Stephens reaction

✅ Correct Answer: 2

Trimer of formaldehyde is known as

1. metaformaldehyde
2. trioxymethylene
3. trioxane
4. All the above

✅ Correct Answer: 4

Ethylidene chloride is hydrolysed with aqueous NaOH. The product formed is

1. Ethanol
2. Ethylchloride
3. Ethanal
4. Ehtane.

✅ Correct Answer: 3

A mixture of acetic acid and formic acid is passed over MnO at 303 degreeCentigrade. The product obtained is

1. benzaldehyde
2. acetaldehyde
3. methane
4. All the above

✅ Correct Answer: 2

Methyl cyanide is dissolved in ethyl formate and reduced with stannous chloride and hydrochloric acid. The product is then steam distilled. The distillate will be

1. ethyl amine
2. formaldehyde
3. methyl alcohol
4. acetaldehyde

✅ Correct Answer: 4

Which of the following is obtained from pyryligenenous acid?

1. Benzaldehyde
2. Acetaldehyde
3. Formaldehyde
4. Acetone

✅ Correct Answer: 4

Which of the following is a hypnotic?

1. Acetaldehyde
2. Metaldehyde
3. Paraldehyde
4. None of these

✅ Correct Answer: 3

Which of the following is liquid at room temperature?

1. Metaldehyde
2. Trioxane
3. Polyoxymethylenes
4. Paraldehyde

✅ Correct Answer: 4

Which of the following is the most reactive?

1. Propanal
2. Propanone
3. Propane
4. Methoxy ethane

✅ Correct Answer: 1

Which of the following will not reduce Tollens reagent?

1. Acetone
2. Acetaldehyde
3. Formaldehyde
4. Benzaldehyde

✅ Correct Answer: 1

Which of the following groups can occur at the end of the chain only?

1. Ether
2. Alcohol
3. Aldehyde
4. Ketone

✅ Correct Answer: 3

Which of the following will give an aldehyde on oxidation?

1. Methoxy ethane
2. 2 methanal
3. 2 methyl propane
4. 1 propanal

✅ Correct Answer: 4

Mesitylene is

1. 1 3 4 trimethyl benzene
2. 1 3 5 trimethyl benzene
3. 2 2 4 trimethyl benzene
4. 2 3 5 trimethyl benzene

✅ Correct Answer: 2

Oximes are isomeric with

1. acids
2. ketones
3. amides
4. aldehydes

✅ Correct Answer: 3

Acetone when distilled with conc. sulphuric acid gives

1. diacetone alcohol
2. mesitylene
3. mesityl oxide
4. toluene

✅ Correct Answer: 2

Vinyl alcohol and ehtanal are

1. Metamers
2. Tautomers
3. Position isomers
4. Chain isomers.

✅ Correct Answer: 2

Which of the following does not undergo benzoin condensation ?

1. Benzene caebaldehye
2. p-Toluene carbaldehye
3. Phenylethanal
4. 4-Methoxybenzaldehyde.

✅ Correct Answer: 3

Which of the following will not form when the mixture of calcium acetate and calciumformate is distilled ?

1. Acetone
2. Propanal
3. Ethanal
4. Methanal.

✅ Correct Answer: 2

Bimolecular reduction of acetone gives

1. Diacetone amine
2. Pinacol
3. Chloretone
4. Propane.

✅ Correct Answer: 4

Which of the following compound will not undergo Cannizzaros reaction ?

1. Benzaldehyde
2. 2 2-Dimethyl propanal
3. Formaldehyde
4. Phenylethanal.

✅ Correct Answer: 4

Clemmensens reduction will convert cyclobutanone to

1. Cyclobutanol
2. Cyclobutyraldehye
3. n-Butane
4. Cyclobutane.

✅ Correct Answer: 4

2-Pentanone and 3-Methylbutan-2-one are

1. optical isomers
2. geometrical isomers
3. metamers
4. tautomers.

✅ Correct Answer: 4

One mole of an organic compound is found to require only 0.5 mole of oxygen to produce an acid. Which class of compound does the starting meterial belong to ?

1. Alcohol
2. Aldehyde
3. Ether
4. Ketone

✅ Correct Answer: 2

Benzaldehyde and malonic acid react to give

1. Ethanal
2. Crotonic acid
3. Cinnamaldehyde
4. Cinnamic acid.

✅ Correct Answer: 4

The main point of similarity between Etards reaction and Vilsmeyer reaction is

1. Starting reagent is benzene
2. Final product in both is benzaldehyde
3. Oxidising agent in both is chromyl chloride
4. Both form ketone as product.

✅ Correct Answer: 2

Which of the following compounds will react with ethanolic KCN?

1. Ethane
2. Acetone
3. Chlorobenzene
4. Benzaldehyde.

✅ Correct Answer: 4

Which of the following name is associated with the reduction of aldehyde/ketone by using the reagent aluminium isopropoxide ?

1. wolff Kishner
2. Meerwein Ponndroff-Verley
3. Wagner-Meerwein
4. Michael.

✅ Correct Answer: 2

The reaction of acetaldehyde and acetone in the presence of dilute alkali is called

1. Crossed aldol condensation
2. Perkins condensation
3. aldol condensation
4. benzoin condensation

✅ Correct Answer: 1

Which aming the following gives positive iodoform test as well as positive Fehling testAcetophenone.

1. Propanal
2. Ethanal
3. Propanone
4. Acetophenone.

✅ Correct Answer: 2

Cannizaro reaction involves

1. Oxidation of aldehydes
2. Oxidation as well reduction of aldehyde molecule
3. Reduction of aldehyde molecule
4. Rearrangement in aldehyde molecule.

✅ Correct Answer: 2

Which of the following ketone will not respond to iodoform test?

1. 3-Methylbutan-2-one
2. Ethyl isopropylketone
3. Methyl phenyl ketone
4. Dimethyl ketone.

✅ Correct Answer: 2

When benzyl methyl ketone is allowed to react with ethylene glycol in benzene the product formed is

1. 2-Benzyl methyl dimethylene-1 3-dioxolane
2. Benzyl glycolone
3. Benzyl alcohol
4. 1 3-Dioxolactic acid

✅ Correct Answer: 1

Which of the following aldehyde will undergo Cannizzaros reaction?

1. Ethanal
2. 2-Methylpropanal
3. 2 2-Dimethylpropanal
4. Phenylacetaldehyde.

✅ Correct Answer: 3

Which ketone will form 3-ethylpentan-3-ol on treatment with ethyl magnesium bromide.

1. Acetone
2. Ethylmethyl ketone
3. Acetophenone
4. Diethyl ketone.

✅ Correct Answer: 4

Which of the following will show disproportionation when treated with 50% aqueous NaOH?

1. Benzyl alcohol
2. Ethanal
3. Phenyl ethanal
4. m-nitro benzaldehyde.

✅ Correct Answer: 4

Which of the following is enolisable.

1. Benzophenone
2. 2 4-Pentanedione
3. Phenyl-t butyl ketone
4. All of the above.

✅ Correct Answer: 2

m-Chlorobenzaldehyde on reaction with conc. KOH at room temperature gives

1. Potassium meta chlorobenzoate and m-Hydroxy benzaldehyde
2. m-Hydroxybenzaldehyde and m-chlorobenzyalcohol
3. m-Chlorobenzyl alcohol and m-Hydroxy benzylalcohol
4. Potassium m-chlorobenzoate and m-Chlorobenzylalcohol.

✅ Correct Answer: 4

The adduct of ethyl magnesium iodide and methanal is hydrolysed. The final product is

1. 1-Propanol
2. 2-Propanol
3. Ethanol
4. 2-Chlor1-propanol.

✅ Correct Answer: 1

The compound having least solubility in water isMethanalAcetone

1. Methanal
2. Acetaldehyde
3. Acetone
4. Acetophenone.

✅ Correct Answer: 4

Which of following possesses highest value of dipole moment ?

1. 1-Butene
2. Butanal
3. Trans 2-Butene
4. 2-Butanone.

✅ Correct Answer: 4

Ehtananl is treated with ammonia and adduct formed is warmed. The final product is

1. Acetaldehyde ammonia
2. Acetaldimine
3. Tetramethylene hexamine
4. Ethyl amine.

✅ Correct Answer: 2

The product of chemical reaction between benzaldehyde and alcoholic KCN is commonly called

1. Aldol
2. Acetal
3. Phoron
4. Benzoin.

✅ Correct Answer: 4

In order to prepare acetone from acetyl chloride in one step which of the following reagent will be best?

1. HI
2. Diethyl candmium
3. Methyl magnesium bromide
4. Dimethyl cadmium.

✅ Correct Answer: 4

Which of the following is capable of acting as hypnotic ?

1. Acetaldehyde
2. Metaldehyde
3. Paraldehyde
4. Formaldehyde.

✅ Correct Answer: 3

Hypnone is commercial name of

1. Methyl phenyl ketone
2. Acetone
3. Benzopheneone
4. Diethyl ketone.

✅ Correct Answer: 1

Pinacolone is

1. 1-phenyl-2-propanone
2. 3 3-Dimethyl-2-butanone
3. 2 3-dimethyl-2 3-butanediol
4. 2 3-Dimethyl but-2-ene.

✅ Correct Answer: 2