Question # 1

Which is a good nucleophile?

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F^-1

Cl^-1

Be^-1

I^-1

Thre rate of S_N2 reaction depends upon the

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Concentration of alkyl halides

Concentration of nucleophile

Concentration of alkyl halides and nucleophile

None of the above

The reaction between primary amine-chloroform and alcoholic caustic potash is called

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Wurtz reaction

Frankland reaction

Cannizzaro's reaction

Carbylamine reaction

When CO₂is made to react with ethyl magnesium iodide, followed by acid hydrolysis, the product formed is

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Propane

Propanoic acid

Propanal

Propanol

Alkyl halides on treatment with aqueous KOH give

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Phenol

Alcohol

Aldehyde

Ketone

The reaction of an alkyl halide with RCOOAg produces

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Ester

Ether

Aldehyde

Ketone

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

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ZnCl₂

Pyridine

H₂SO₄

Either

Which responds to +ve iodoform test?

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Butanol-1

Butan-1-al

Butanol-2

2-pentanone

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

The reactivity order of alkyl halides for a particular alkyl group is:

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F >Cl>Br>I

Cl>Br>F>l

l>Br>Cl>F

Br>l>Cl>F

In primary alkyl halides, the halogen atom is attached to a carbon which attached to how many carbon atoms?

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Two

Three

One

Four

Alkyl halides react with Mg in dry ether to form

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Magnesium halide

Grignard's reagent

Alkene

Alkyne

Which of the following chlorocompounds is heat easily hydrolysed by hydorxide ion to give the product indicated

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When chloroform is boiled with NaOH, it gives

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Formic acid

Trihydroxymethane

Acetylene

Sodium formate

Which of the following compounds will form a hydrocarbon on reaction with Grignard reagent

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A ketone

An aldehyde

An ether

Water

Which of the following undergoes uncleophilic substitution exclusively by S_N1 mechanism?

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Benzyl chloride

Ethyl chloride

Chlorobenzene

Isopropyl choride

When CO₂is made to react with ethyl megnesium iodine, followed by hydrolysis, the product formed is:

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Propane

Propanoic acid

Propanal

Propanol

Reaction of Griganard's reagent with CO₂gives:

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Aldehyde

Pri-alcohol

Sec-alcohal

Carboxylic acid

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 of the following with aqueous KOH will give acetaldehyde?

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1, 2-Dichloroethane

1,1-Dichloroethane

Chloracetic acid

Ethyl chloride

For which mechanisms, the first step involved is the same:

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E₁ and E₂

E₂and SN₂

E₂ and E₁

E1 and SN₁

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

Grignard's reagent on treatment with chloramine give

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Acetamide

Primary amice

Secondary amice

Urea

SN₂reactions can be best carried out with:

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Prl. alkyl halide

Sec. Alkyl halide

Ter. Alkyl halide

All of three

Alkyl halides react with lithium dialkyl copper reagents to give

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Alkenes

Alkyl copper halides

Alkanes

Alkenyl halides

Which one of the following in mainly responsible for depletion of ozone layer?

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Methane

Carbon dioxide

Water

chloroflurocarbons

E₁mechanism is generally shown by

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1° - RX

2° - RX

3° - RX

None of these

Which of the followings is not a nulceophile

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OH^-

NH₃

C₂H₅O^-

Br₂

Ethyl alcohol gives ethyl chloride with the help of

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SOCl₂

NaCl

Cl₂

KCl

Reduction of alkyl halides give

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Alkanes

Alkenes

Ketones

Ether

1, 3-Dibromopropane reacts with metallic zinc to form

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Propene

Propane

Cyclopropane

Hexane

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