1
Question
Which of the following is not formed by the reaction of Cl2 with CH4 in presence of sunlight?
Which of the following is not formed by the reaction of Cl2 with CH4 in presence of sunlight?
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Solution
The correct option is A CH3−CH2−CH3
When one or more H atoms of an alkane are replaced by Halogen, such reactions are called Halogenation Reaction.
Halogenation reaction takes place at high temperature (573 K to 773 K) in presence of diffused or ultraviolet (UV) light.
Halogenation proceeds via free radical chain mechanism involving following three steps:
1) Initiation
2) Propagation
3) Termination
Chain initiation step:
Cl−Clhν→∙Cl+∙Cl
Chain propagation step:
∙Cl+CH4hν→∙CH3+HCl
∙CH3+Cl−Clhν→CH3Cl+∙Cl
The above two steps have more focus since they produce the principal product CH3Cl.
But other steps are also possible which generate more highly halogenated products.
Example:
CH3−Cl+∙Cl→∙CH2Cl+HCl
∙CH2−Cl+Cl−Cl→CH2Cl2+∙Cl
possible Chain termination Step -
∙Cl+∙Cl→Cl2
∙CH3+∙CH3→CH3−CH3
When one or more H atoms of an alkane are replaced by Halogen, such reactions are called Halogenation Reaction.
Halogenation reaction takes place at high temperature (573 K to 773 K) in presence of diffused or ultraviolet (UV) light.
Halogenation proceeds via free radical chain mechanism involving following three steps:
1) Initiation
2) Propagation
3) Termination
Chain initiation step:
Cl−Clhν→∙Cl+∙Cl
Chain propagation step:
∙Cl+CH4hν→∙CH3+HCl
∙CH3+Cl−Clhν→CH3Cl+∙Cl
The above two steps have more focus since they produce the principal product CH3Cl.
But other steps are also possible which generate more highly halogenated products.
Example:
CH3−Cl+∙Cl→∙CH2Cl+HCl
∙CH2−Cl+Cl−Cl→CH2Cl2+∙Cl
possible Chain termination Step -
∙Cl+∙Cl→Cl2
∙CH3+∙CH3→CH3−CH3
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