NMDCAT Quiz: Benzene & Alkyl Halides
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
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:
CN
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
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
E1
E2
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
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