Question # 1

Which of the following compounds does not react with NaHSO₃?

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C₆H₅CHO

Acetophenone

Acetone

Acetaldehyde

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

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

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

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

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Oxide

Alkali

Alkoxide ion

None of these

A common industrial solvent is a mixture of propanone; CH₃COCH₃, and pentyl ethanoate CH₃CO₂(CH₂)₄CH₃. Which reagent would have no effect on this solvent

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Na_(s)

NaBH₄

NaOH_(aq)

2,4-dinitrophenylhydrazine reagent

Aldehydes are oxidizes are to give:

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Primary alcohol

Sec-alcohol

Ter-alcohol

Carboxylic acid

Which is used for the reduction of aldehydes and ketones

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NaBH₄

Pt/Pd

Ni

All of these

The carbon of a carbonyl group is:

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sp hybridized

sp²hybridized

sp³Hybidized

None of these

The carbon atom of a carbonyl group is

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Sp hybridized

Sp²hybridized

Sp³hybridized

None of these

An organic compound has the following properties ; It gives a positive tri-iodomethane test; it gives a yellow ppt, with 2, 4-DNP regent; it does not react with Tollen's reagent . Which compound would give these results

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CH₃CHO

CH₃CH₂OH

CH₃CH₂COCH₃

CH₃CH₂CH₂CHO

Which of the following compounds will react with reagent ?

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CH₃ CO H

CH₃ CO CH₃

CH_{3 COOH}

CH₃CO CH₂CH₃

In carboxyl group the bond between C and oxygen is:

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Sigma bond

Single bond

Double Bond

Triple bond

Formalin is:

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

Aldehydes and ketones are carbonyl compounds. Which of them react both with NaBH₄and with Tollen's reagent

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Both aldehydes and ketones

Aldehydes only

Ketones only

Neither aldehydes nor ketones

Acetone is prepared by

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Oxidation of n-propyl alcohol

Oxidation of acetaldehyde

Pyrolysis of calcium acetate

Pyrolysis of calcium acetate as well as acetic acid

Chromic acid used to oxidize

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Aldehyde

Ketone

Both a and b

None of these

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

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

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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With H₂/Ni CH₃(CH₂)₅CH₂OH

With H₂/Ni CH₃(CH₂)₅CH₃

With NaBH₄ CH₃(CH₂)₅CH₂OH

With NaBH₄ CH₃(CH₂)₅CHO

Reaction of Grignard's reagent eith aldehyds other formaldehyde gives: Reaction of Grignard's reagent with formaldehyde gives:

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Pri-alcohol

Sec-alcohol

Ter-alcohol

Carboxylic

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

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White

Red

Yellow

None of these

Formaline Contains ______% alcohol

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80

37

8

52

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

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CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

Reduction of aldehydes with HI and P gives

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Primary alcohols

Secondary alcohols

Alkanes

Tertiary alcohols

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde

Hydrogenation of bezoyl chloride in presence of Pd on BaSO₄gives

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Benzyl alcohol

Benzaldehyde

Benzoic acid

Phenol

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

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Acetaldehyde

Ketone

Ether

Carboxylic acid

Which of the following reagents is used to distinguish acetone and acetophenone

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NaHSO₃

Grinard reagent

Na₂SO₄

NH₄Cl

A compound A has a molecular formula C₂Cl₃OH. It reduces Fehling solution and on oxidation produces a monocarboxylic acid B.A can also be obtained by the action of Cl₂on Ethanol. A is

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Chloral hydrate

CHCl₃

CH₃Cl

Chloroacetic acid

Acetone is oxidized with

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Tollen's reagent

Fehling solution

Acidic dichromate solution

Benedicts solution

Which one of the following reagents will distinguish between C₆H₅CHO and C₆H₅COCH₃

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Aqueous bromine

Phosphorus pentachloride

2, 4 DNPH

Tollen's reagent

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