Question # 1

In beta elimination reaction

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carbon number changes

unsaturated compound is formed

hybridization. ofC remains same

pi bonds are decreased

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

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

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Electrophilic addition

Nucleophilic addition

Electrophilic substitution

Nucleophilic substitution

Correct statement about Nucleophilic substitution bimolecular is

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Transition state is formed

Inversion take place

It is two step reacticn

Both a &c

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

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F-

Cl-

Br-

I-

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 one among the following is not a good leaving group

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HSO4-

CI-

OH-

Br-

The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of

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Carbocation

Carbanion

Pentavalent carbon in the transition state

Free radical

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

An amine is produced in the following reaction
C2H5l+2NH3-------C2H5NH2 +NH4l. What is mechanism?

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Which of the following reactions does not involve formation of carbocation?

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SN1 and E1

El and E2

SN1 and SN2

E2 and SN2

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

Dehydrohalogenation of secondary butyI bromide will give

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Propene

1-Butene

Butene

2-Butene

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

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

Which isomer of C4H9Br will produce 2-methyl propane-2-ol on treatment with aqueous KOH

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n-butyI bromide

Sec-butyI bromide

Isobutyl halide

Tertiary butyl chloride

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

An alkyl halide reacts with NH3 to give

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Amide

Cyanide

Amine

Aniline

Which of the following alkyl halides undergoes SN1 reaction fastest

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Methyl chloride

Isobutyl chlorido

Ethy l chloride

Tertiary butyl chloride

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

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