Question # 1

Which of the following alkyl halides undergoes SN1 reaction fastest

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Methyl chloride

Isobutyl chlorido

Ethy l chloride

Tertiary butyl chloride

Dehydrohalogenation of secondary butyI bromide will give

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Propene

1-Butene

Butene

2-Butene

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

Which compound is obtained hy the elimination reaction on bromoethane?

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Butene

Ethene

Propene

Propane

Which of the following is primary alkyl halide

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IsopropyI halide

Sec-butyl halide

Tert-buryi halide

Neo-pentyl halide

Which is an intermediate in Svl

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Ethoxide ion

Alkene

Alkyl halide

Carbocation

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

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Chlorination

Halogenation

Dehydrohalogenation

Hydrogenation

Chloroform (CHCl3) is?

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

a liquid

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

The carbon atom of an alkyl group attached with halogen atom is called

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Electrophile

Free redical

Nucleophile

Nucleophilic centre

SN2-reactions can be usually observed in

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Primary alkylı halide

secondary alkyl halide

Tertiary alkyl halide

Both A. and B

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

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Electrophilic addition

Nucleophilic addition

Electrophilic substitution

Nucleophilic substitution

The rate of E1 reaction depends upon

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The concentration of substrate

The concentration of substrate as well as nucleophile

The concentration Nucleophilic

Nature of Catalyst

^{Reaction of ethyl bromide with ammonia}

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Completes in a single step

Completes in two steps

Continues till N is left with no lone pair

is reversible

Which one of the following is NOT a nucleophile

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NH2+

BF3

H2O

CH3-

Among the following, which one is nucleophile

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H+

Ca2+

OH-

Na+

Elimination unimolecular reactions involve

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Second order kinetics

First order kinetics

Third order kinetics

Zero order kinetics

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 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

For which mechanisms, the first step involved is the same

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E1 and E2

E2 and SN2

E2 and E1

E1 and SN1

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