Question # 1

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

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Caronium ion

Carbanion

Oconium ion

Carba ion

Steps in SN , reactions are:

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One

Two

Three

Four

Reation of which with Grignard's reagent gives primary alcohol:

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Formaldehyde

Aldehyde

Ketones

Acetone

E₁mechanism is generally shown by

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1° - RX

2° - RX

3° - RX

None of these

To get DDT, chlorobenzene has to react with one of the following compound in the presence of conc.H₂SO₄

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Trichloroethane

Dichloroacetone

Dichloroacetaldehyde

Trichloroacetealdehyde

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 of the following compounds gives trichoromethane on distilling with bleaching power?

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Methanal

Phenol

Ethanol

methanol

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Condensation

Electrophilic substitution

Free radical substitution

Nucleophilic substitution

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCl + anhyd. Zncl₂

NaCl

PCl₅

SOCl₂

Electronegativity order of alkyl halides is:

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Rl > RBr > RCl > RF

Rbr > RCl > RF >Rl

RCl > RF >Rl > RBr

RF >Ri > RBr >RII

Among the following the most reactive towards alcoholic KOH is

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CH₂= CHBr

CH₃COCH₂CH₂Br

CH₃CH₂Br

CH₃CH₂CH₂Br

DDT is formed from

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Benzene and Chlorobenzene

Chloral and Chlorobenzene

Chloral and Benzene

Chlorobenzene and chlorine

General formula of alkyl halide is:

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R----X

R----OH

R------COH

R------COOH

Which of the following does not give iodoform test?

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Ethanol

Ethanal

Acetophenone

Bezophenone

1, 3-Dibromopropane reacts with metallic zinc to form

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Propene

Propane

Cyclopropane

Hexane

If ketone reacts with Grignard's reagent, it also produces alcohol, But it will be a

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primary alcohol

Secondary alcohol

Tertiary alcohol

Aromatic alcohol

Catalyst in the reaction ROH + SOCl₂-------> RCL+SO₂+HCl is:

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ZnCl₂

Pyridine

H₂SO₄

Either

By reaction Grignard's reagent with the HCHO we get

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1° - alcohol

2° - alcohol

3° - alcohol

All of these

Which is a good nucleophile?

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F^-1

Cl^-1

Be^-1

I^-1

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

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

SN2 reaction can be best carried out with

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All the three

The alkyl halide is converted into an alcohol by

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Addition

Substitution

Dehydrohalogenation

Elimination

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

CFCs undergo homolytic fission by uv light in the stratosphere which radical could result from this irradiations of CHCICF₂Cl.

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CHF Cl C FCl

CH Cl CF₂Cl

CHF CF₂Cl

C FCl CF₂Cl

Reaction of ethylamine with chloroform in alcoholic KOH produces

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

The chloroform reacts with NaOH to give

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CH₃COONa

Sodium oxalate

CH₃OH

HCOONa

Grignard's reagent on treatment with carbonyl compounds yield

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Pheonol

Alcohol

Alkane

None of these

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

The order of reactivity for a given halogen in Grignard's reagent is:

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CH₃X > C₂H₅X > C₃H₄X > C₄H₄X

C₂H₅X > C₃H₇X > C₄H₅X > CH₄X

C₃H₇X > C₄H₇X > CH₃X > C₂H₅X

C₄H₄X > C₃H₇X > C₂H₅X > CH₄X

Gammexane is

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Chlorobenzene

Benzyl chloride

Brommobenzene

Benzene hexachloride

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