Question # 1

Which of the following reacts with chloroform and base to form phenyl isocynaide?

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Nitrobenzene

Phenol

Chlorobenzene

Aniline

Which of the followings is not a nulceophile

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OH^-

NH₃

C₂H₅O^-

Br₂

S_N1 reaction of alkylhalides leads to

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Retention of configuration

Recemisation

Inversion of configuration

None of these

When alkyl halide is heated with aqueous solution of ammonia at 100°C the major product is

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Primary amine

Secondary amine

Tertiary amine

Mixture of amines and salt

Dehydrohalogenation of alkyl halides give

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Alkanes

Alkenes

Alkynes

Alkdehyde

When an alcohol reacts with SOCI₂an alkyl halide is formed. What are two other products

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SO₂and HCI

SI₂and H₂O

HCI and H₂O

H₂S and HCI

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Condensation

Electrophilic substitution

Free radical substitution

Nucleophilic substitution

The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to

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4-Bromobenzyl cyanide

4-Cyanobenzyl chloride

4-Cyanobenzyle cyanide

4-Bromo 2-cyanobenzyl chloride

Grignard reagent is not prepared in aqueous medium but prepared in ether medium because

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The reagent is highly reactive in ether

The reagent does not react with water

The reagent becomes inactive in water

The reagent reacts with water

Which one of the following is not a nuclelphile

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H₂O

H₂S

BF₃

NH₃

The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is

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Iodide > bromide > chloride

Chloride > bromide > iodide

Bromide > chloride > iodide

Bromide > iodide > chloride

Which responds to +ve iodoform test?

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Butanol-1

Butan-1-al

Butanol-2

2-pentanone

Which of the following does not give iodoform test?

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Ethanol

Ethanal

Acetophenone

Bezophenone

Hydrolysis of Grignard's reagent gives:

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Alkane

Alkyl

Halide

Alcohol

By simply reacting Grignand's reagent with water we get

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An alkane

Higher alkane

An alkene

An alkyne

Alcohol can be prepared from Grignard's reagent with an aldehyde: If we start with formaldehyde the product alcohol with be

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Primary

Secondary

Territory

Aromatic

Alkyl halides on treatment with Zn and HCI gives

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Alkanes

Alkenes

Alkynes

Alcohols

A set of compounds in which reactivity of halogen atom in the ascending order is

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Chlorobenzene, vinyl chloride, chloroethane

Chloroethane, chlorobenzene, vinyl chloride

Vinyl chloride,chlorobenzene chloroethane

Vinyl chloride, chloroethane,chlorobenzene

Which is a weak nucleophile

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OH^-

Br^-

NH₃

CI^-

Which one of the following will have the maximum dipole moment

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CH₃F

CH₃Cl

CH₃Br

CH₃l

With the increase in size of halogen atom the reactivity of an alkyl halide

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Increases

Decreases

Remain constant

None of these

Which is a good nucleophile?

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F^-1

Cl^-1

Be^-1

I^-1

The alkyl halide molecule on which a nucleophile attacks is called

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Substrate

Subsituent

Substituted

All of these

General formula of alkyl halide is:

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R----X

R----OH

R------COH

R------COOH

When alkyl halides are heated with aqueous solution of ammonia at about 100°C, amines are formed. This reaction is known as

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Williamsons synthesis

GHoffmans reaction

Wurtz reaction

Clemensen reaction

Metal used in the preparation of Grignard's reagent is:

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Ca

Na

Mg

Zn

Alkyl halides react with Mg in dry ether to form

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Magnesium halide

Grignard's reagent

Alkene

Alkyne

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Electrophilic substitution

Free radical reduction

Isomerisation

Nucleophilic substitution

The rate of E₁reaction depends upon

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The concentration of substrate

The concentration of nucleophile

THe concentration of substrate as well as nucleophile

None of the above

Alkyle halides can be prepared by treating halogen acids with

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Ethane

Ethanol

Ethene and ethanol

Aldehyde

DDT is formed from

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Benzene and Chlorobenzene

Chloral and Chlorobenzene

Chloral and Benzene

Chlorobenzene and chlorine

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