Haloalkanes and Haloarenes Test

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Haloalkanes and Haloarenes Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

Arrange these haloalkanes in correct order of density:

A
$$CH_3I < C_2H_5I < C_3H_7I$$

B
$$CH_3I > C_2H_5I > C_3H_7I$$

C
$$CH_3I < C_2H_5I > C_3H_7I$$

D
$$CH_3I > C_2H_5I < C_3H_7I$$

Solution

Haloalkanes are more dense than alkane, from which they are derived and usually more dense than water. Density increases with the number of carbon and halogen atom increases.
Question 2
1 / -0

Which is used as an anaesthetic during surgery?

A
Chloroquine

B
Thyroxine

C
Halothane

D
Chloramphenicol

Solution

$$A : $$ Chloroquine - used for malaria.
$$B : $$ Thyroxine - Hormone of Thyroid gland.
$$C : $$ Haloethane - Anesthetic during surgery.
$$D : $$ Chloramphenicol - Antibiotic for bacterial infections.
Question 3
1 / -0

Which of the following is not correct for haloalkanes?

A
Density is directly proportional to the mass of compound

B
Haloalkanes are slightly soluble in water

C
Boiling Point depends upon the intermolecular forces of attraction

D
None of these

Solution

For any compounds density is directly proportional to the mass of compound and Haloalkanes are partially soluble in water as the lower haloalkanes are polar in nature.
The boiling point depends upon the intermolecular forces of attraction.
Thus, all statements are correct.
Question 4
1 / -0

Which of the following statements is correct about halogens?

A
they are all capable of exhibiting more than one oxidation states

B
they are all diatomic and form diatomic ions

C
they are all diatomic and form univalent ions

D
they are all reducing agents

Solution

Halogens are all diatomic and form univalent ions. All halogens can act as both oxidizing and reducing agents and are capable of exhibiting more than one stable oxidation state except F.
Question 5
1 / -0

Choose the correct order of bond strength:

A
$$CH_3F > CR_3Cl > CR_3Br > CH_3I$$

B
$$CH_3F < CR_3Cl < CR_3Br < CH_3I$$

C
$$CH_3F > CR_3Cl > CR_3Br < CH_3I$$

D
$$CH_3F > CR_3Cl < CR_3Br < CH_3I$$

Solution

Bond strength : $$C-F > C-CI > C-Br > C-I$$
bond strength $$(kJ \, mol^{-1})$$
$$C-F \,\,\,\,\,\, 484$$
$$C-CI \,\,\,\, 338$$
$$C-Br \,\,\,\, 276$$
$$C-I \,\,\,\,\,\,\,\, 238$$
Question 6
1 / -0

Pure form of alkyl halide is:

A
odourless

B
colourless

C
both colourless and odourless

D
neither colourless nor odourless

Solution
Question 7
1 / -0

Nature of $$C-X$$ bond is:

A
ionic

B
covalent

C
co-ordinate

D
none of these

Solution

Non-metals form covalent bonds. Electronegativity of halogens is greater than carbon hence nature of $$ C-X$$ bond is polar covalent, formed by sharing of one electron each.
Question 8
1 / -0

Bond order of $$C-X$$ bond is $$1$$ because :

A
$$Cl$$ achieve noble gas configuration by sharing one electron

B
$$C$$ not able to form multiple bonds

C
$$Cl$$ does not have vacant orbitals

D
$$C$$ achieve noble gas configuration by sharing one electron

Solution

Bond order of $$C-X$$ bond is 1 because halogen atoms are one atom deficient to a noble gas configuration which is attached by sharing of one electron and formation of one sigma bond.
Question 9
1 / -0

Alkyl halides develop colour on:

A
addition of water

B
addition of non polar solvent

C
exposure to light

D
exposure to air

Solution

Alkyl bromides and iodides develop colour when exposed to light. Halogens have lower bond dissociation energy. This low enthalpy means that even at normal temperature or on exposure to sunlight, they decompose and form free ions, which are coloured and hence impart colour on exposure to light.
Question 10
1 / -0

Bond order of $$C-X$$ bond is:

A
$$1$$

B
$$2$$

C
$$0.5$$

D
$$0$$

Solution

$$\begin{array}{l}\text { Bond order - Actually how many bonds present } \\\text { between two atom is known as Bond order. } \\\text { Bond order }=\dfrac{\text { Number of bonding-Number of antibonding}}{2}\end{array}$$
$$\stackrel{\text { or }}{\text {bond order is valency of the molecule }}$$
$$\text{C-X bond order is 1}$$

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Haloalkanes and Haloarenes Test - 39

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Haloalkanes and Haloarenes Test - 39

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Question 1

$$CH_3I < C_2H_5I < C_3H_7I$$

$$CH_3I > C_2H_5I > C_3H_7I$$

$$CH_3I < C_2H_5I > C_3H_7I$$

$$CH_3I > C_2H_5I < C_3H_7I$$

Solution

Question 2

Chloroquine

Thyroxine

Halothane

Chloramphenicol

Solution

Question 3

Density is directly proportional to the mass of compound

Haloalkanes are slightly soluble in water

Boiling Point depends upon the intermolecular forces of attraction

None of these

Solution

Question 4

they are all capable of exhibiting more than one oxidation states

they are all diatomic and form diatomic ions

they are all diatomic and form univalent ions

they are all reducing agents

Solution

Question 5

$$CH_3F > CR_3Cl > CR_3Br > CH_3I$$

$$CH_3F < CR_3Cl < CR_3Br < CH_3I$$

$$CH_3F > CR_3Cl > CR_3Br < CH_3I$$

$$CH_3F > CR_3Cl < CR_3Br < CH_3I$$

Solution

Question 6

odourless

colourless

both colourless and odourless

neither colourless nor odourless

Solution

Question 7

ionic

covalent

co-ordinate

none of these

Solution

Question 8

$$Cl$$ achieve noble gas configuration by sharing one electron

$$C$$ not able to form multiple bonds

$$Cl$$ does not have vacant orbitals

$$C$$ achieve noble gas configuration by sharing one electron

Solution

Question 9

addition of water

addition of non polar solvent

exposure to light

exposure to air

Solution

Question 10

$$1$$

$$2$$

$$0.5$$

$$0$$

Solution

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