Haloalkanes and Haloarenes Test

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Haloalkanes and Haloarenes Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Haloarenes react with halogens in the presence of _________ as the catalyst to give ortho-para isomers.

A
ferric chloride

B
sodium chloride

C
potassium chloride

D
magnesium chloride

Solution

feric chloride act as lewis acid catalyst which helps in generating halonium ion which act as a electrophile favorable for electrophilic substitution at ortho and para position of haloarenes.
Question 2
1 / -0

The monohalogen derivatives of alkanes are called:

A
alkene halide

B
haloalkanes

C
halogen alkyl

D
none of the above

Solution

The mono halogen derivatives of saturated hydrocarbon alkanes are called haloalkanes.
Question 3
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Identify the correct statement about nomenclature of alkyl halide.

A
The monohalogen derivatives of alkanes are called as alkyl halides.

B
The common name of an alkyl halide is always written as two separate words.

C
In IUPAC system, the monohalogen derivatives of alkanes are named as haloalkanes.

D
All of above.

Solution

The monohalogen derivatives of alkanes are called as alkyl halides denoted as $$R-X$$ where ($$R-$$) is the alkyl group and $$X-$$ is the halogen atom. The common name of an alkyl halide is always written as two separate words. In IUPAC system, the monohalogen derivatives of alkanes are named as haloalkanes. for e.g., methyl chloride has IUPAC name chloromethane.
Question 4
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Identify the correct statement about nomenclature of alkylidene dihalides.

A
Dihaloalkanes in which two halogen atoms of the same type are present on the same carbon atom are called alkylidene dihalides.

B
In common naming system these are called as alkylene dihalides

C
In the IUPAC system, the locants for the two halogen atoms are prefixed to the name of dihaloalkane.

D
Both $$A$$ and $$C$$

Solution

$$ C{ H }_{ 3 }CH{ X }_{ 2 } $$ ethylidene dihalide or 1, 1-dihaloethane.

Alkylidene dihalides are also known as geminal halides. The term gem has derived from geminal meaning for the same position. The two similar halogen atoms are attached to the same carbon atom.

Hence, the correct option is $$D$$
Question 5
1 / -0

The difference in electronegativity of carbon-halogen bond is minimum in:

A
$$C-F$$

B
$$C-Cl$$

C
$$C-I$$

D
$$C-Br$$

Solution

Down the group electronegativity decreases.

$$C-I$$ It has the least electronegativity difference among carbon-halogen bond.

Option C is correct.
Question 6
1 / -0

$$C-X$$ bond is strongest in:

A
$$CH_3Cl$$

B
$$CH_3Br$$

C
$$CH_3F$$

D
$$CH_3I $$

Solution

The carbon-halogen bonds (apart from the carbon-iodine bond) are polar, because the electron pair is pulled closer to the halogen atom than the carbon. This is because (apart from iodine) the halogens are more electronegative than carbon. The Carbon-Fluorine bond is strongest.
Question 7
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In $$R-X$$ the bond length is maximum in:

A
$$C-F$$

B
$$C-Cl$$

C
$$C-Br$$

D
$$C-I$$

Solution

As we progress down the periodic table from fluorine to iodine, molecular size increases. As a result, we also see an increase in bond length. Conversely, as molecular size increases and we get longer bonds, the strength of those bonds decreases.
Question 8
1 / -0

IUPAC name of the above compound is:

A
$$3$$-Chlorotoluene

B
$$4$$-Chlorotoluene

C
$$4$$-Methylchlorobenzene

D
$$3$$-Methylchlorobenzene

Solution

When one hydrogen of benzene is replaced by methyl group then it is called toluene. Chlorine attaches at para position is called p-chlorotoluene or 4-chlorotoluene.
Question 9
1 / -0

Which of the following molecule would have a carbon halogen bond most susceptible to nucleophilic substitution?

A
$$2$$-fluorobutane

B
$$2$$-chlorobutane

C
$$2$$-bromobutane

D
$$2$$-idobutane

Solution

2-iodobutane is more susceptible to nucleophilic substitution because the $$C-I$$ bond is weak as compared to $$C-Br,\ C-Cl$$ and $$C-F$$ bond.
Question 10
1 / -0

Which of the following statement is correct?

A
The $$C-X$$ bond in haloalkanes is more polar than the $$C-X$$ in haloarenes.

B
The $$C-X$$ bond in haloalkanes is less polar than the $$C-X$$ in haloarenes.

C
Polarity of $$C-X$$ bond in haloalkane is equal to the polarity of $$C-X$$ bond in haloarenes

D
Polarity of $$C-X$$ bond in both depends on conditions.

Solution

In haloarenes due to resonance, charge distribution or rotation of charge on benzene nucleus takes place hence the $$C-X$$ bond in haloalkanes ( which are not aromatic) is more polar than the $$C-X$$ bond in halo arenes (aromatic)

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Re-Attempt Weekly Quiz Competition

Haloalkanes and Haloarenes Test - 37

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Haloalkanes and Haloarenes Test - 37

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Question 1

ferric chloride

sodium chloride

potassium chloride

magnesium chloride

Solution

Question 2

alkene halide

haloalkanes

halogen alkyl

none of the above

Solution

Question 3

The monohalogen derivatives of alkanes are called as alkyl halides.

The common name of an alkyl halide is always written as two separate words.

In IUPAC system, the monohalogen derivatives of alkanes are named as haloalkanes.

All of above.

Solution

Question 4

Dihaloalkanes in which two halogen atoms of the same type are present on the same carbon atom are called alkylidene dihalides.

In common naming system these are called as alkylene dihalides

In the IUPAC system, the locants for the two halogen atoms are prefixed to the name of dihaloalkane.

Both $$A$$ and $$C$$

Solution

Question 5

$$C-F$$

$$C-Cl$$

$$C-I$$

$$C-Br$$

Solution

Question 6

$$CH_3Cl$$

$$CH_3Br$$

$$CH_3F$$

$$CH_3I $$

Solution

Question 7

$$C-F$$

$$C-Cl$$

$$C-Br$$

$$C-I$$

Solution

Question 8

$$3$$-Chlorotoluene

$$4$$-Chlorotoluene

$$4$$-Methylchlorobenzene

$$3$$-Methylchlorobenzene

Solution

Question 9

$$2$$-fluorobutane

$$2$$-chlorobutane

$$2$$-bromobutane

$$2$$-idobutane

Solution

Question 10

The $$C-X$$ bond in haloalkanes is more polar than the $$C-X$$ in haloarenes.

The $$C-X$$ bond in haloalkanes is less polar than the $$C-X$$ in haloarenes.

Polarity of $$C-X$$ bond in haloalkane is equal to the polarity of $$C-X$$ bond in haloarenes

Polarity of $$C-X$$ bond in both depends on conditions.

Solution

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