Question # 1

Compounds X, Y and Z, all react with PCI₅to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z

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What is formed when propanone is refluxed with an anhydrous solution of NaBH₄

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Propanal

Propan-1-ol

Propan-2-ol

Propane

Aldehydes which do not haveα-hydrogen undergo

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Aldol combination

Cannizzaro's reaction

Substitution

Elimination

Chromic acid used to oxidize

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Aldehyde

Ketone

Both a and b

None of these

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Q and R Q and R

R only Q and R

Q and R R only

Q only R only

Ketones are reduced to

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Primary alcohol

Secondary alcohol

Tertiary alcohol

All of these

Which of the following compounds will not give iodoform test on treatment with I₂/ NaOH?

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Acetaldehyde

Acetone

Butane

3-pentanone

In formadaldehyde and KOH are heated then we get

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Acetylene

Methane

Methyl alcohol

Ethyl formate

Which isomer of C₅H₁₁OH gives, one dehydration, the greastest number of different alkenes

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

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Formaldehyde

Ethanenitrile

Ethyl alcohol

Methyl iodide

Aniline reacts with which of these to form Schiff base?

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Acetic acid

Bezaldehyde

Acetone

NH₃

Aldehydes can be distinguished from ketones by

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2,4-DNPH test

NaHSO₃test

N₂H₄test

Tollen's test

The homologous series of aldehydes and ketones have general formula:

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C_nH_2nO

C_nH_nO

C_nH_2n-1O

C_nH_nO_n

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

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Propanal and mesitylene

Propanone and mesityl oxide

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

Propanone and mesitylene oxide

Cannizzaro's reaction in not given by

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Formaldehyde

Acetaldehyde

Benzaldyhyde

Trimethylacetaldehyde

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

Clemensen's reduction of ketones is carried out in

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H₂with Pd catalyst

Glycol with KOH

LiAIH₄in water

Zn-Hg with conc. HCl

Aldehydes is distinguished from ketones by using

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Tollen's reagent

Benedict reagent

Fehling solution

All of the above

Ketones are prepared by the oxidation of

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Primary alcohol

Secondary alcohol

Tertiary alcohol

None of these

A nucleophilic reagent will readily Attack

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Ethylene

Ethanal

Ethanol

Ethylamine

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With H₂/Ni CH₃(CH₂)₅CH₂OH

With H₂/Ni CH₃(CH₂)₅CH₃

With NaBH₄ CH₃(CH₂)₅CH₂OH

With NaBH₄ CH₃(CH₂)₅CHO

From which of the following tertiary butyl alcohol is obtained by the action of methyl magnesium iodide?

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HCHO

CH₃CHO

CH₃COCH₃

CO₂

Which of the following does not turn Schiff's reagent to pink?

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Formaldehyde

Bezaldehyde

Aceton

Methyl chloride

Which of the following react with NaOH to produce an acid and an alcohol?

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NCHO

CH₃COOH

CH₃CH₂COOH

C₆H₅COOH

Aldelydes are the oxidation product of

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P-alcohols

s-alcohols

ter-alcohols

carboxylic acids

Which of the following does not react with phenyl hydrazine?

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Ethanol

Ethanal

Acetone

Acetophenone

Give IUPAC name fo Acetone

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Ethanal

Propanone

Butanone

Propanal

Which of the following reagent will react with both aldehyde and ketones?

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Grinard's reagent

Tollen's reagent

Fehling's reagent

Benedict's reagent

Reduction with aluminium isopropoxide in excess of Isopropyl alcohol is called Meerwein Ponndroff-Verley reduction (MPV). What will be the final product when cyclohex-2-enone is selectively reduces in MPV reaction?

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Cyclohexanol

Cyclohex-2-enol

Cyclohexanone

Benzene

Which is used for the reduction of aldehydes and ketones

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NaBH₄

Pt/Pd

Ni

All of these

Which is not true about acetophenone?

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Reacts to form 2,4-dintrophenyl hydrazine

Reacts with Tollen's reagent to form silver mirror

Reacts with I₂/NaOH to form iodoform

On oxidation with alkaline KMnO₄followed by hydrolysis gives benzoic acid

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

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