Question # 1

In an elimination reaction a more substituted alkene is formed due to the stability associated with

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Free radical

transition state

Activated complex

Carbocation

Which of the following alkyl halides undergoes SN1 reaction fastest

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Methyl chloride

Isobutyl chlorido

Ethy l chloride

Tertiary butyl chloride

When purely alcoholic solution of sodium/potassiumhydroxide and halogenoalkanes are reacted an alkene is formed, what is the mechanism of reaction?

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Elimination

Debromination

Dehydration

Reduction

The order of reactivitv of alksI halides towards nucleophile is

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RI>RBr RF>RCI

RF>RCI>RBr>RI

RI>RBr> RCI>RE

RF>RBr>RCI>RI

Which pair gives same dehydrohalogenation product

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I-Chlorobutane, 2-Chlorobutane

I-Chloropropane, 2-Chloropropane

I-Bromopentane. 3-Bromopentane

iso-butvl chloride. 2°- butyl chloride

Which is a good nucleophile as well as a good leaving group?

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F-

Cl-

Br-

I-

The reaction C2H5CI + aqueous KOH---------C2H5OH+ KCI is

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Electrophilic addition

Nucleophilic addition

Electrophilic substitution

Nucleophilic substitution

Which one among the following is not a good leaving group

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HSO4-

CI-

OH-

Br-

An alkyl halide reacts with NH3 to give

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Amide

Cyanide

Amine

Aniline

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

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Chlorination

Halogenation

Dehydrohalogenation

Hydrogenation

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

Which compound is obtained hy the elimination reaction on bromoethane?

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Butene

Ethene

Propene

Propane

The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH

The reagent and the condition used in this reaction may be:

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H20 at room temperature

KOH in alcohol

Ethanol. heat

Dilute NaOH(aq) warm

In nucleophilie substitution bimolecular reaction the order of reaction with respect to substrate

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2 order

3 order

1st order

Zero order

Which of the following decides the reactivity of alkyl halides?

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C-C bond strength

C-H bond strength

C-X bond strength

Electronegativity difference

The species which are produced by heterolytic bond breaking and can act as electron pair donor

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Free radicals

Cations

Nucleophiles

electrophile

Correct order for the reactivity ofalkyl halide in S, reactions

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R-I>R-F>R-CI

R-F>R-CI>R-I

R-I>R-CI>R-F

R-CI>R-I>R-F

Which one of the following is not associated with SN2 mechanism

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100 % inversion of configuration

Tertiar alkyI halides

2nd order kinetics

Change of hy bridization from sp³ to sp² in transition state

The average bond energy of C-Br is

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228 kJmol-1

250 kJmol-1

200 kJmol-1

290 kJmol-1

Which of the following factors does not affect the SN1 rate is

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Nucleophilicity of the attacking nucleophile

Stability of the carbonium ion

Solvent system

The nature of leaving group

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