Alkyl Halides & Aryl Halides Test

Result

Alkyl Halides & Aryl Halides Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which C-X bond has the highest bond energy per mole?

A
C-Br

B
C-Cl

C
C-F

D
C-I

Solution

Bond energies depend on many factors: electron affinities, sizes of atoms involved in the bond, differences in their electronegativity, and the overall structure of the molecule. There is a general trend in that the shorter the bond length, the higher the bond energy.
Question 2
1 / -0

Which alkyl halide has the highest reactivity for a particular alkyl group?

A
R-F

B
R-Cl

C
R-I

D
R-Br

Solution

Reactivity order for the alkyl halides towards Sn2 reaction is R-I>R-Br>R-Cl>R-F. This can be explained by which halogen atom is a better leaving group compared to the other.
Question 3
1 / -0

When ethyl chloride reacts with nascent hydrogen, what is the formed product?

A
Methane

B
Propane

C
Butane

D
Ethane

Solution

When an alkyl halide is treated with zinc and hydrochloric acid, it is reduced to the respective alkane. The nascent hydrogen formed by the reaction between zinc and HCl acid reduces ethyl chloride to ethane.
Question 4
1 / -0

Which alkyl halide out of the following may follow both S_N1 and S_N2 mechanism?

A
CH₃-X

B
(CH₃)₂CH-X

C
(CH₃)₃C-X

D
(CH₃)₃C-CH₂-X

Solution

(CH₃)₂CH-X follows both S_N1 and S_N2 mechanism because the second CH₃ of (CH₃)₂CH-X further blocks a nucleophile (such as: OH) in backside S_N2 attack, but it increases the stability of the carbocation resulting from S_N1 ionization. As a result, S_N1 and S_N2 mechanisms are sometimes competitive for (CH₃)₂CH-X.
Question 5
1 / -0

When two moles of ethyl chloride react with two moles of sodium in the presence of ether what will be formed?

A
2 moles of ethane

B
1 moles of ethane

C
2 moles of butane

D
1 moles of butane

Solution

Wurtz reaction is method of preparation of higher alkanes from lower alkyl halides. This is coupling reaction. In this reaction alkyl halides are reacted with sodium metal in presence of dry ether and higher alkanes with even number of carbon atoms only are formed, by this method.
Question 6
1 / -0

Dehydrohalogenation of 1,2 di-bromo cyclohexane gives which of the following compound?

A

B

C

D

Solution

As we can see in below reaction that double E2 elimination yields the conjugated diene, 1,3-cyclohexadiene. Note the overall transformation is alkene to conjugated diene.
Question 7
1 / -0

Which one of the following possess highest melting point?

A
Chlorobenzene

B
o-dichlorobenzene

C
m-dichlorobenzene

D
p-dichlorobenzene

Solution

p-dichlorobenzene molecule has symmetrical structure. It can fit well in its crystal lattice. The intermolecular forces of attraction are strong. Hence, it possesses highest melting point.
Question 8
1 / -0

What would be the product formed for the following reaction?

A

B

C

D

Solution

When 1-Bromo-3-chloro cyclobutane reacts with two equivalents of metallic sodium in ether it is the example of Wurtz reaction.
Question 9
1 / -0

Which of these can be used as moth repellent?

A
Benzene hexachloride

B
Benzal chloride

C
Hexachloroethane

D
Tetrachloroethane

Solution

Hexachloroethane can be used as moth repellent. It has also been used as a plasticizer for cellulose esters in place of camphor, a polymer additive, a component of fungicidal and insecticidal formulations, in the formulation of extreme pressure lubricants, and in the manufacture of fire extinguishing fluids.
Question 10
1 / -0

What will be the product for the following reaction?

A

B

C

D

Solution

−CCl₃ is a m-directing group. So, attack will be at meta position.