Haloalkanes and Haloarenes Test

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Haloalkanes and Haloarenes Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is an example of vic-dihalide?

A
Dichloromethane

B
1,2-dichloroethane

C
Ethylidene chloride

D
Allyl chloride

Solution

vic-dihalides have two halide groups linked to two adjacent carbon atoms in their chain structures. In 1, 2 dichloroethane, the two chlorine atoms are attached to two adjacent carbon atoms, therefore, it is an vic-dihalide.
Question 2
1 / -0

The position of –Br in the compound in \(CH_3CH = CHC(Br)(CH_3)_2\) can be classified as ________.

A
Allyl

B
Aryl

C
Vinyl

D
Secondary

Solution

These are the compounds in which the halogen atoms is bonded to an \(sp^3\) hybridised carbon atom next to carbon-carbon double bond (C = C) i.e., to an allylic carbon.
Question 3
1 / -0

Chlorobenzene is formed by reaction of chlorine with benzene in the presence of \(AlCl_3\). Which of the following species attacks the benzene ring in this reaction?

A

\(Cl ^–\)

B

\(Cl ^+\)

C
\(AlCl_3\)

D

\([AlCl_4 ] ^–\)

Solution

\(Cl^+\), known as chloronium ion is generated as an electrophile during chlorination of benzene in presence of anhydrous \(AlCl_3\) and acts as an attacking species over the benzene ring.
Question 4
1 / -0

Ethylidene chloride is a/an _________.

A
vic-dihalide

B
gem-dihalide

C
allylic halide

D
vinylic halide

Solution

gem-dihalides are compounds in which both the halogen atoms are linked with the same carbon atom. They are known as alkylidene halides \(CH_3—CHCl_2\) also. The structure of 'Ethylidene chloride' shows that both halogen atoms are present on same carbon atom so, it is gem-dihalide.
Question 5
1 / -0

A primary alkyl halide would prefer to undergo _______.

A
\(S_N1\) reaction

B
\(S_N 2\) reaction

C
α–Elimination

D
Racemisation

Solution

\(S_N2\) type reactions ( ie.bimolecular nucleophilic substitution) proceed in one step and the rate of reaction depends on concentration of alkyl halide as well as nucleophile i.e. r = k[RX][Nu:]. It is a second-order reaction. During \(S_N2\) reaction, inversion in configuration occurs (viz. starting with dextrorotatory halide a laevorotatory product is obtained and vice-versa.)
Question 6
1 / -0

Which of the following alkyl halides will undergo \(S_N 1\) reaction most readily?

A

\((CH_3 ) _3C—F\)

B

\((CH_3 ) _3C—Cl\)

C

\((CH_3 ) _3C—Br\)

D

\((CH_3 ) _3C—I\)

Solution

\(S_N1\) type (unimolecular nucleophilic substitution) reactions proceed in two steps. The rate of reaction is dependent on step1 i.e., only on the concentration of alkyl halide r = k [RX]. It is a first order reaction. Further, R---------X bond length in case of R---I is longest it has lowest bond dissociation enthalpy. Therefore, \(I^-\) is known as best leaving group.
Question 7
1 / -0

Which is the correct IUPAC name for \(CH_3 -\underset{\underset{C_2H_5}{|}}{CH}-CH_2 - Br\) ?

A
1-Bromo-2-ethylpropane

B
1-Bromo-2-ethyl-2-methyl methane

C
1-Bromo-2-methyl butane

D
2-Methyl-1-bromobutane

Solution

(i) Longest chain in the structural formula consists of four carbon atoms, hence the root word is ' butane'.

(ii) Numbering of carbon atoms in the carbon chain has to be done with an end at which the substituent ' Br ' is linked with the respective carbon atom.
Question 8
1 / -0

What should be the correct IUPAC name for diethylbromomethane?

A
1-Bromo-1,1-diethylmethane

B
3-Bromopentane

C
1-Bromo-1-ethylpropane

D
1-Bromopentane

Solution

(i) The structural formula of given compound ' diethylbromomethane ' reveals that the longest chain of carbon atoms has five C -atoms in it, therefore the root word is ' pentane '.

(ii) The substituent ' Br ' is linked with the third carbon atom of the longest chain, hence the IUPAC name of diethylbromomethane is ' 3-bromopentane'

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Re-Attempt Weekly Quiz Competition

Haloalkanes and Haloarenes Test - 17

Result

Haloalkanes and Haloarenes Test - 17

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SHARING IS CARING

Question 1

Dichloromethane

1,2-dichloroethane

Ethylidene chloride

Allyl chloride

Solution

Question 2

Allyl

Aryl

Vinyl

Secondary

Solution

Question 3

\(Cl ^–\)

\(Cl ^+\)

\(AlCl_3\)

\([AlCl_4 ] ^–\)

Solution

Question 4

vic-dihalide

gem-dihalide

allylic halide

vinylic halide

Solution

Question 5

\(S_N1\) reaction

\(S_N 2\) reaction

α–Elimination

Racemisation

Solution

Question 6

\((CH_3 ) _3C—F\)

\((CH_3 ) _3C—Cl\)

\((CH_3 ) _3C—Br\)

\((CH_3 ) _3C—I\)

Solution

Question 7

1-Bromo-2-ethylpropane

1-Bromo-2-ethyl-2-methyl methane

1-Bromo-2-methyl butane

2-Methyl-1-bromobutane

Solution

Question 8

1-Bromo-1,1-diethylmethane

3-Bromopentane

1-Bromo-1-ethylpropane

1-Bromopentane

Solution

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