Chemistry Test

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Chemistry Test - 2

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Weekly Quiz Competition

Question 1
4 / -1

Wurtz reaction involves the reduction of alkyl halide with

A
Zn/HCl

B
HI in presence of red phosphorus

C
sodium in ether

D
Zn/Cu couple

Solution

Explanation:

Wurtz reaction involves the reduction of alkyl halide with sodium in ether.
Question 2
4 / -1

A
16.761

B
26.383

C
13.260

D
23.484

Solution

Explanation:
Question 3
4 / -1

The best method to separate the mixture of ortho and para nitrophenol (1 : 1) is

A
vapourisation

B
colour spectrum

C
distillation

D
crystallisation

Solution

Explanation:

Ortho and para nitrophenol is separated by distillation beacuse p -nitrophenol has higher boiling point than o -nitrophenol due to H-bonding.
Question 4
4 / -1

In which of the following properties is hydrogen different from halogens?

A
Electronic configuration

B
Ionisation enthalpy

C
Oxidation state

D
Atomicity

Solution

Explanation:

Electronic configuration of halogens is ns²np⁵, while hydrogen has half-filled valence shell, i.e. ns1.

Hydrogen and halogens both have a high ionisation energy.

Hydrogen can exhibit -1 oxidation state like the halogens.

Hydrogen as well as halogens occur as diatomic molecules.
Question 5
4 / -1

Fluorobenzene (C₆H₅F) can be synthesised in the laboratory

A
by heating phenol with HF and KF

B
from aniline by diazotisation, followed by heating the diazonium salt with HBF₄

C
by direct fluorination of benzene with F₂gas

D
by reacting bromobenzene with NaF solution

Solution

Explanation:

Flurobenzene can be synthesised from aniline by diazotisation, followed by heating the diazonium salt with HBF₄.
Question 6
4 / -1

Addition of HCl to vinyl chloride gives 1,1–dichloroethane because of

A
inductive effect of Cl

B
restricted rotation around the double bond

C
mesomeric effect of Cl

D
None of these

Solution

Explanation:

During the addition of HCl to vinyl chloride carbocation is formed as an intermediate which is stabilised by mesomeric effect of Cl^-.
Question 7
4 / -1

Formation of terylene is an example of

A
condensation polymerisation

B
addition polymerisation

C
esterification

D
saponification

Solution

Explanation:

Terylene (a polyester) is formed by condensation polymerization and the structure of Terylene represented as

This is the same kind of 'ester linkage' (-COOC-) found in fats which are combination of long chain fatty carboxylic acids and glycerol (alcohol with 3 -OH groups, a 'triol').
Question 8
4 / -1

In the following reaction, predict the compounds X and Y.

A

B

C

D

Solution

Explanation:

The complete reaction is as follows:
Question 9
4 / -1

Which of the following is an example of man made ecosystem?

A
Aquarium

B
Pond

C
Forest

D
Lake

Solution

Explanation:

Aquarium is an example of man made ecosystem.
Question 10
4 / -1

The rate of a reaction can be increased in general by all the factors except by

A
using a catalyst

B
increasing temperature

C
increasing the activation energy

D
increasing the concentration of reactant

Solution

Explanation:

This option is correct because, it is the minimum amount of energy required by reactant molecule to get converted into product. Hence this option is correct.