NMDCAT Quiz: Benzene & Alkyl Halides

A detailed illustration of benzene and alkyl halides, showing their structures, reactions, and the role of electrophiles in organic chemistry, in a vibrant and educational style.

NMDCAT Quiz: Benzene & Alkyl Halides

Test your knowledge on benzene and alkyl halides with this comprehensive NMDCAT quiz. Designed for students who are preparing for their medical college admission, this quiz covers essential concepts and reactions related to aromatic compounds.

Features of the quiz:

45 multiple choice questions
In-depth coverage of benzene and alkyl halides
Ideal for self-assessment and review

45 Questions11 MinutesCreated by ExaminingMolecule42

The carbon-carbon and C-H bond lengths in benzene molecule are respectively:

1.54 A, 1.08 A

1.33 A, 1.08 A

1.397 A, 1.09 A

1.20 A, 1.08 A

The electrophile in aromatic sulphonation is:

H2SO4

HSO4

SO3+

SO3

When toluene is oxidized in the presence of KMnO4, the product is:

Benzopheone

Benzyl acetate

Picric acid

Benzoic acid

Which of the following is not alicyclic aromatic?

Cyclopropane

Cyclobutane

Toluene

Cyclopentane

Aromatic hydrocarbons containing two or more benzene rings in their molecules can be divided into main classes:

Two

Three

Four

Five

Benzene reacts with HNO3 in the presence of H2SO4 to form nitrobenzene. What is the role of H2SO4:

Solvent

Removing H2O produced

Protonating HNO3

Forming unstable complex with benzene

Benzene is made up of:

12 bonds (3 pi,9 sigma)

12 bonds ( 6 pi, 6 sigma)

15 bonds (3pi, 12 sigma)

16 bonds ( 4 pi, 12 sigma)

Not meta directing group:

-CN

-OH

-COOH

-CHO

Will readily undergo sulphonation:

Benzene

Nitrobenze

Toluene

Chlorobenzene

Will form benzoic acid on oxidation with strong oxidizing agent:

Toluene

Ethyl-benzene

N-propyl benzene

All

Hydrolysis of benzene sulphonic acid with super heated steam or by boiling with dil. HCl gas:

Toluene

Benzene

Xylene

Chlorobenzene

The active specie involved in nitration of benzene is:

NO+

NO2+

NO3+

NO2

Most stabilized by resonance:

Cyclobenzene

Benzene

Naphthalene

Anthracene

The oxidation of which compound yields benzoic acid:

Isopropyl benzene

N-propyl benzene

Isobutyl benzene

All

Not ortho-para directing group?

-NH3

-OCH3

-CHO

-OH

Meta directing group:

COOH

COR

All

As a catalyst in Friedel-Craft reaction?

HNO3

BeCl2

CuCl2

AlCl3

Toluene can be converted into benzoic acid on reacting with:

Dil. NaOH

Dil. HNO3

Conc. HNO3

Acidified KMnO4

Benzene does not undergo reaction:

Addition

Substitution

Polymerization

Aromatization

Arrange the following ortho-para directing groups in increasing order to increase the reactivity of benzene ring: I. -OH ii. -R iii. -Cl

OH>Cl>R

R>OH>Cl

OH=Cl=R

Which group is ortho and para directing as well as ring de-activator?

-OH

-OR

-Cl

Not Possible

More reactive specie:

Phenol

Nitrobenzene

Toluene

Chlorobenzene

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

Two

One

Three

Four

Not a nucleophile:

H2O

BF3

H2S

NH3

Alkyl halides are considered to be very reactive compounds toward nucleophiles, because:

They have an electrophile carbon

They have an electrophilic carbon and a bad leaving group

They have an electrophilic carbon and a good leaving group

They have a nucleophilic carbon and a good leaving group

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

Fluride>chloride>bromide>iodide

Chloride>bromide>fluride>iodide

Iodide>bromide>chloride>fluride

Bromide>iodide>chloride>fluride

Alkyl iodide is reactive due to:

Primary nature of alkyl halides

The low dissociation energy of C-I bond

The presence of I atom

Secondary nature of alkyl halides

SN1 mechanism of reaction depends on all the factors except:

Nature of solvent

Structure of alkyl halides

Nature of leaving group

Strength of attacking nucleophile

C-X bond has least value of bond energy:

C-F

C-Br

C-Cl

C-I

Poor leaving group:

Cl-

Br-

HSO4-

OH-

When the reaction between methyl iodide and sodium ethoxide occurs, we get

Methyl acetate

Ethyl acetate

Methyl ethyl ketone

Methyl ethyl ether

Which of the following type of mechanism of reaction has 50% inversion and 50% retention of configuration:

SN1

SN2

First step is common:

SN2 & E1

SN1 & E1

SN2 & E2

None

Carbocation is a/an:

Electrophile

Free radical

Nucleophile

Group of atoms

1-bromobutane on reaction with alcoholic potassium hydroxide gives:

1-butanol

2-butene

1-butene

1-butyne

Carbonium ion is:

Electrophile

Nucleophile

Free radical

Group of atoms

An amine is produced in the following reaction:( C2H5I + 2NH3---------> C2H5NH2 + NH4I ) What is the mechanism?

Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Nucleophilic substitution reaction in the presence of polar solvent for secondary alkyl halide will favour mechanism:

100 % SN1

100 % SN2

50 % SN1 & 50 % SN2

More % age of SN1 THAN SN2

The order of reactivity of the following alkyl halides for SN2 reaction is:

RF>RCl>RBr>RI

RF>RBr>RCl>RI

RCl>RBr>RF>RI

RI>RBr>RCl>RF

The order of the ease of formation of carbonium ion of alkyl halide is:

Prim. > sec.> tert.

Tert. > sec. > prim

Sec. > prim. > tert.

Tert. > pri. > sec.

During elimination reactions, the KOH used is:

Neutral

Acidic

Basic

Alcoholic

More reactive:

Methyl bromide

Ethyl bromide

Propyl bromide

All have same reactivity

The charge on intermediate product of SN1 reaction:

Neutral

Positive

Negative

Both positive & negative

When alkyl halide reacts with excess of ammonia, the final product will be:

Primary amine

Secondary amine

Tertiary amine

Quaternary alkyl ammonium ion

When ammonia reacts with excess of alkyl halide, the final product will be:

Primary amine

Secondary amine

Tertiary amine

Quaternary alkyl ammonium ion

NMDCAT Quiz: Benzene & Alkyl Halides

NMDCAT Quiz: Benzene & Alkyl Halides

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