Haloalkanes and Haloarenes Test

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Haloalkanes and Haloarenes Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Haloalkanes contain halogen atom (s) attached to the sp³ hybridised carbon atom of an alkyl group. Identify haloalkane from the following compounds.

(i) 2-Bromopentane

(ii) Vinyl chloride (chloroethene)

(iii) 2-chloroacetophenone

(iv) Trichloromethane

A
(ii) and (i)

B
(iii) and (iv)

C
(ii) and (iii)

D
(i) and (iv)

Solution

2-Bromopentane (CH₃ − CH₂ − CH₂ − CH(Br) − CH₃) contains a bromo group (-Br) attached to a carbon which is sp³ hybridised. Similarly, in trichloromethane, the chloro group is directly attached to sp3 hybridised carbon atom. Hence both are haloalkanes. In vinyl chloride and 2-chloroacetophenone, halo group is attached to sp² carbon.
Question 2
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Ethylene chloride and ethylidene chloride are isomers. Identify the correct statements.

(i) Both the compounds form same product on treatment with alcoholic KOH.

(ii) Both the compounds form same product on treatment with aq.NaOH.

(iii) Both the compounds form same product on reduction.

(iv) Both the compounds are optically active.

A
(i) and (iii)

B
(i) and (iv)

C
(ii) and (iii)

D
(iii) and (iv)

Solution

Both will give ethyne on treatment with alc. KOH and both will give ethane on reduction.

Question 3

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Match the compounds given in Column I with the effects given in Column II.

Column I	Column II
(i) Chloramphenicol	(a) Malaria
(ii) Thyroxine	(b) Anaesthetic
(iii) Chloroquine	(c) Typhoid fever
(iv) Chloroform	(d) Goiter
(iv) Chloroform	(e) Blood substituent

(i)- (c), (ii)- (d), (iii)- (a), (iv)- (b)

(i)- (b), (ii)- (d), (iii)- (a), (iv)- (c)

(i)- (c), (ii)- (a), (iii)- (d), (iv)- (b)

(i)- (c), (ii)- (b), (iii)- (d), (iv)- (a)

Solution

Column I	Column II
(i) Chloramphenicol	(c) Typhoid fever (chloramphenicol is a broad-spectrum antibiotic used in the treatment of typhoid fever)
(ii) Thyroxine	(d) Goiter (Thyroxine is a hormone secreted by thyroid gland. Patient with hyperthyroidism have an enlarged thyroid gland i.e., goiter)
(iii) Chloroquine	(a) Malaria (chloroquine prevents the development of malaria in blood)
(iv) Chloroform	(b) Anaesthetic (Chloroform is a colourless volatile liquid. Its vapours decreases the activity of central nervous system and is used as an anaesthetic.

Question 4
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Assertion : Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.

Reason : Phosphorus chlorides give pure alkyl halides.

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion is correct but reason is wrong statement.

D
Assertion is wrong but reason is correct statement.

Solution

Assertion and reason both are wrong, because,

(i) Phosphorous chlorides (tri and penta), when reacted with alcohols, doesn't gived pure alkyl halide.

(ii) Thionyl chloride is preferred because the other two products obtained are escapable gases ( i.e. HCl and SO₂) Hence, the reaction gives pure alkyl halides.
Question 5
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Assertion: The boiling points of alkyl halides decrease in the order: RI > RBr > RCl > RF.

Reason: The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion and reason both are wrong statements.

D
Assertion and reason both are correct statements but reason is not correct explanation of assertion.

Solution

(i) For the same alkyl group, the boiling points of alkyl halides decrease in the order: RI > RBr > RCl > RF; hence assertion is correct.

(ii) the given statement for the reason of assertion is correct, but it is not the correct explanation of assertion. The correct reason is - This is because, with the increase in size and mass of halogen atom, the magnitude of van der Waal forces increases.
Question 6
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Assertion: KCN reacts with methyl chloride to give methyl isocyanide.

Reason : CN^– is an ambident nucleophile.

A
Assertion and reason both are correct and reason is correct explanation of assertion.

B
Assertion and reason both are wrong statements.

C
Assertion is correct but reason is wrong statement.

D
Assertion is wrong but reason is correct statement.

Solution

Assertion is wrong because, 'KCN is predominantly ionic and provides cyanide ions in solution. Although both carbon and nitrogen atoms are in a position to donate electron pairs, the attack takes place mainly through carbon atom and not through nitrogen atom since C—C bond is more stable than C—N bond. ' Hence with reaction of CN with methyl chloride, methyl cyanide (CH₃CN) is formed, and not the isocyanide.

The statement for the given reason ( ie. CN⁻ is an ambident nucleophile ) is correct.

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Haloalkanes and Haloarenes Test - 15

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Haloalkanes and Haloarenes Test - 15

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Question 1

(ii) and (i)

(iii) and (iv)

(ii) and (iii)

(i) and (iv)

Solution

Question 2

(i) and (iii)

(i) and (iv)

(ii) and (iii)

(iii) and (iv)

Solution

Question 3

(i)- (c), (ii)- (d), (iii)- (a), (iv)- (b)

(i)- (b), (ii)- (d), (iii)- (a), (iv)- (c)

(i)- (c), (ii)- (a), (iii)- (d), (iv)- (b)

(i)- (c), (ii)- (b), (iii)- (d), (iv)- (a)

Solution

Question 4

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion is correct but reason is wrong statement.

Assertion is wrong but reason is correct statement.

Solution

Question 5

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion and reason both are wrong statements.

Assertion and reason both are correct statements but reason is not correct explanation of assertion.

Solution

Question 6

Assertion and reason both are correct and reason is correct explanation of assertion.

Assertion and reason both are wrong statements.

Assertion is correct but reason is wrong statement.

Assertion is wrong but reason is correct statement.

Solution

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