Haloalkanes And Haloarenes Test

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Haloalkanes And Haloarenes Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

The free radical iodination of hydrocarbons requires an oxidizing agent like HgO because

A
the reaction is reversible

B
the HI formed is oxidized to I₂

C
the HI formed is removed as insoluble HgI₂

D
the yield of the product is otherwise less

Solution

HgO + 2HI → HgI₂ + H₂O
Question 2
1 / -0

Alkyl fluorides are prepared indirectly from alkyl chlorides using inorganic fluorides such as AsF₃, AgF, SbF₃,etc. The process is referred to as Swart's reaction. Direct fluorination of alkanes is avoided because

A
the reaction is spontaneous only at high temperatures

B
the reaction is slow

C
the reaction requires a high activation energy

D
the reaction occurs explosively with the rupture of C-C bonds

Solution

Fluorination of hydrocarbons is highly exothermic and is explosive even in the dark.
Question 3
1 / -0

In the Finkelstein reaction for preparation of iodoalkanes from alkyl chlorides and bromides, acetone is used as

A
NaI is soluble in acetone, but NaBr and NaCl are not

B
alkyl halides are soluble in acetone

C
acetone is a universal organic solvent

D
acetone catalyzes the reaction

Solution

NaBr and NaCl, being insoluble in organic solvents, can be easily removed from the mixture.
Question 4
1 / -0

Neopentyl chloride is preferably prepared by free radical chlorination of neopentane because

A
a 3^o free radical is formed

B
free radicals do not undergo rearrangements

C
Both (1) and (2)

D
Neither (1) nor (2)

Solution

A carbocation intermediate would undergo rearrangement.
Question 5
1 / -0

Sandmeyer's method of preparation of chlorobenzene proceeds through which of the following mechanisms?

A
Electrophilic substitution

B
Nucleophilic substitution

C
Free radical substitution

D
Free radical addition

Solution

Homolytic cleavage of the C-N bond takes place to form free radical intermediates.
Question 6
1 / -0

The boiling point of the alkyl halides (for the same alkyl group) increases in the following order:

R-I > R-Cl > R-Br > R-F

Which of the following options justifies the trend?

A
Increase in the van der Waals forces of attraction

B
Increase in the polarity of C-X bond

C
Decrease in the polarity of C-X bond

D
Increase in dipole–dipole interactions

Solution

The van der Waals forces of attraction increase as the mass and the size of a halogen atom increase.
Question 7
1 / -0

When exposed to light, which of the following alkyl halides is/are expected to develop colour?

(i) C₂H₅I
(ii) C₂H₅Cl
(iii) C₂H₅F
(iv) C₂H₅Br

A
(i) and (ii)

B
(i) only

C
(ii) and (iv)

D
(i) and (iv)

Solution

Alkyl halides are colourless when pure; iodides and bromides develop colour on exposure to light.
Question 8
1 / -0

In the presence of two different β-hydrogens, the dehydrohalogenation of fluoroalkanes would yield

A
a Saytzeff product

B
a Hofmann product

C
a Markovnikov product

D
a Karasch product

Solution

The F^– ion is a stronger base and a poor leaving group and thus, yields a Hofmann product.
Question 9
1 / -0

The correct order for nucleophilic substitution among the alkyl halides is

A
R-Cl > R-Br > R-I > R-F

B
R-F > R-Br > R-I > R-Cl

C
R-Cl > R-F > R-I > R-Br

D
R-I > R-Br > R-Cl > R-F

Solution

The reactivity decreases with a decrease in the C-X bond length.

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Haloalkanes And Haloarenes Test - 6

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Haloalkanes And Haloarenes Test - 6

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Question 1

the reaction is reversible

the HI formed is oxidized to I2

the HI formed is removed as insoluble HgI2

the yield of the product is otherwise less

Solution

Question 2

the reaction is spontaneous only at high temperatures

the reaction is slow

the reaction requires a high activation energy

the reaction occurs explosively with the rupture of C-C bonds

Solution

Question 3

NaI is soluble in acetone, but NaBr and NaCl are not

alkyl halides are soluble in acetone

acetone is a universal organic solvent

acetone catalyzes the reaction

Solution

Question 4

a 3o free radical is formed

free radicals do not undergo rearrangements

Both (1) and (2)

Neither (1) nor (2)

Solution

Question 5

Electrophilic substitution

Nucleophilic substitution

Free radical substitution

Free radical addition

Solution

Question 6

Increase in the van der Waals forces of attraction

Increase in the polarity of C-X bond

Decrease in the polarity of C-X bond

Increase in dipole–dipole interactions

Solution

Question 7

(i) and (ii)

(i) only

(ii) and (iv)

(i) and (iv)

Solution

Question 8

a Saytzeff product

a Hofmann product

a Markovnikov product

a Karasch product

Solution

Question 9

R-Cl > R-Br > R-I > R-F

R-F > R-Br > R-I > R-Cl

R-Cl > R-F > R-I > R-Br

R-I > R-Br > R-Cl > R-F

Solution

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the HI formed is oxidized to I₂

the HI formed is removed as insoluble HgI₂

a 3^o free radical is formed