Basic concepts and hydrocarbons

Ethane reacts with chlorine in the presence of ultraviolet light to form chloroethane via a free-radical substitution mechanism.

Which of the following pairs represents the radical intermediates that are directly involved in the propagation stage of this mechanism?

$H∙\text{H}^\bullet$ and $C2H5∙\text{C}_2\text{H}_5^\bullet$

$Cl∙\text{Cl}^\bullet$ and $C2H5∙\text{C}_2\text{H}_5^\bullet$

$Cl∙\text{Cl}^\bullet$ and $CH3∙\text{CH}_3^\bullet$

$H∙\text{H}^\bullet$ and $Cl∙\text{Cl}^\bullet$

Basic concepts and hydrocarbons Questions

Ethane reacts with chlorine in the presence of ultraviolet light to form chloroethane via a free-radical substitution mechanism.

Which of the following pairs represents the radical intermediates that are directly involved in the propagation stage of this mechanism?

$H∙\text{H}^\bullet$ and $C2H5∙\text{C}_2\text{H}_5^\bullet$

$Cl∙\text{Cl}^\bullet$ and $C2H5∙\text{C}_2\text{H}_5^\bullet$

$Cl∙\text{Cl}^\bullet$ and $CH3∙\text{CH}_3^\bullet$

$H∙\text{H}^\bullet$ and $Cl∙\text{Cl}^\bullet$