Haloalkanes and Haloarenes Test

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Haloalkanes and Haloarenes Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Which is the correct increasing order of boiling points of the following compounds?

1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene

A
Bromobenzene < 1-Bromobutane < 1-Bromopropane < 1-Bromoethane

B
Bromobenzene < 1-Bromoethane < 1-Bromopropane < 1-Bromobutane

C
1-Bromopropane < 1-Bromobutane < 1-Bromoethane < Bromobenzene

D
1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene

Solution

The attractions get stronger as the molecules get bigger in size and have more electrons.
Question 2
1 / -0

Which of the following are secondary bromides?

(i) \((CH_3)_2 CHBr \)

(ii) \((CH_3)_3C CH_2Br \)

(iii) \(CH_3CH(Br)CH_2CH_3 \)

(iv) \((CH_3)_2CBrCH_2CH_3\)

A
(i) and (iii)

B
(ii) and (iv)

C
(i) and (ii)

D
(iii) and (iv)

Solution

Secondary bromides are bromides where the bromo group (-Br) is bonded to a secondary or 2- degree carbon atom. (ie 2°C).

Thus in, (\(CH_3)_2CHBr\) – Bromide group is attached to sec –carbon or 2°C. \(CH_3CH(Br)CH_2CH_3\)- here also, the Bromide group is attached to sec- carbon or 2°C.
Question 3
1 / -0

Which of the following compounds can be classified as aryl halides?

(i) \(p-ClC_6H_4CH_2CH(CH_3 )_2 \)

(ii) \(p-CH_3CHCl(C_6H_4 )CH_2CH_3 \)

(iii) \(o-BrH_2C-C_6H_4CH(CH_3 )CH_2CH_3 \)

(iv) \(C_6H_5 -Cl\)

A
(i) and (ii)

B
(i) and (iv)

C
(iii) and (iv)

D
(ii) and (iii)

Solution

Aryl halides: These are the compounds in which the halogen atom is bonded to the \(sp^2\) hybridised carbon atom of an aromatic ring.
Question 4
1 / -0

Alkyl halides are prepared from alcohols by treating with

(i) \(HCl + ZnCl_2 \)

(ii) Red P + \(Br_2 \)

(iii) \(H_2 SO_4\) + KI

(iv) All the above

A
(i) and (ii)

B
(iii) and (ii)

C
(i) and (iv)

D
(ii) and (iv)

Solution

\(R - OH + HX \underset{}{\stackrel{ZnCl_2}{\longrightarrow}}\) R - X + \(H_2O\)

R - OH \(\underset{X_2-Br_2,I_2}{\stackrel{red \; P/X_2}{\longrightarrow}}\) \(R - X\)
Question 5
1 / -0

Alkyl fluorides are synthesised by heating an alkyl chloride/bromide in presence of _______ or _________.

(i) \(Ca F_2\)

(ii) \(CoF_2 \)

(iii) \(Hg_2F_2 \)

(iv) NaF

A
(ii) and (iii)

B
(i) and (iii)

C
(ii) and (iv)

D
(i) and (ii)

Solution

The synthesis of alkyl fluorides is best accomplished by heating an alkyl chloride/ bromide in the presence of a metallic fluoride such as AgF, \(Hg_2F_2, CoF_2 \;or\; SbF_3\). The reaction is termed as Swartsrection.

\(CH_3Br + AgF \rightarrow CH_3F^- + Ag^-Br\)
Question 6
1 / -0

Assertion : It is difficult to replace chlorine by –OH in chlorobenzene in comparison to that in chloroethane.

Reason : Chlorine-carbon (C—Cl) bond in chlorobenzene has a partial double bond character due to resonance.

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

The statement at assertion 'It is difficult to replace chlorine by—OH in chlorobenzene in comparison to that in chloroethane' is a correct statement and the statement given for reason (ie. ' Chlorine - Carbon (C-Cl) bond in chlorobenzene has a partial double bond character due to resonance' is also correct.
Question 7
1 / -0

Assertion : Hydrolysis of (–)-2-bromooctane proceeds with inversion of configuration.

Reason : This reaction proceeds through the formation of a carbocation.

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

Hydrolysis of (—)-2- bromooctane proceeds with inversion of configuration because the reaction proceeds through \(S_N2 \) mechanism. The formation of carbocation occurs when the reaction proceeds through \(S_N1\) mechanism. Therefore, given statements at assertion is correct, but that at reason is wrong.
Question 8
1 / -0

Assertion : Nitration of chlorobenzene leads to the formation of m-nitro chlorobenzene

Reason : —\(NO_2\) group is a m-directing group.

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

Even though, \(NO_2\) group is m-directing group halogen atom in chlorobenzene besides being slightly deactivating is o, p-directing; therefore, further substitution occurs at ortho- and para-positions with respect to the halogen atom. So m-nitrochlorobenzene cannot be expected as a product in this case. This confirms that the given statement at assertion is wrong, but reason is correct.
Question 9
1 / -0

Among the halogens, the one which is oxidized by nitric acid is

A
iodine

B
chlorine

C
bromine

D
fluorine

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Re-Attempt Weekly Quiz Competition

Haloalkanes and Haloarenes Test - 20

Result

Haloalkanes and Haloarenes Test - 20

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SHARING IS CARING

Question 1

Bromobenzene < 1-Bromobutane < 1-Bromopropane < 1-Bromoethane

Bromobenzene < 1-Bromoethane < 1-Bromopropane < 1-Bromobutane

1-Bromopropane < 1-Bromobutane < 1-Bromoethane < Bromobenzene

1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene

Solution

Question 2

(i) and (iii)

(ii) and (iv)

(i) and (ii)

(iii) and (iv)

Solution

Question 3

(i) and (ii)

(i) and (iv)

(iii) and (iv)

(ii) and (iii)

Solution

Question 4

(i) and (ii)

(iii) and (ii)

(i) and (iv)

(ii) and (iv)

Solution

Question 5

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

(i) and (ii)

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

Question 7

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 8

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 9

iodine

chlorine

bromine

fluorine

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