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Properties of Methane

Which of the ...

Question

Which of the following cannot be considered as a mechanistic step in chain reaction of methane with ${C l}_{2}$ ?

A

{C l}_{2} ⟶ {C l}^{*}

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B

{C H}_{4} + {C l}^{*} ⟶ {C H}_{3} C l + H^{*}

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C

{C l}^{*} + {C H}_{4} ⟶ {C H}_{3} + H C l

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D

{C l}^{*} + {C H}_{3} ⟶ {C H}_{3} C l

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Solution

The correct option is B ${C H}_{4} + {C l}^{} ⟶ {C H}_{3} C l + H^{}$
The mechanism of chlorination of methane involves the following steps
First is the chain initiation step : $C l_{2} + h v \to 2 C l^{∙}$
Second is the chain propagation step : $C H_{4} + C l^{∙} \to C H_{3} + H C l$
Third is the chain termination step: $C l^{∙} + C {H_{3}}^{∙} \to C H_{3} C l$
So the step not involved here is $C H_{4} + C l^{∙} \to C H_{3} C l + C l^{∙}$
Hence the correct answer is option B

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Similar questions

Q. Which step is chain propagation step in the following mechanism?

C l_{2} h v - \to C l^{∙} + C l^{∙}

C l^{∙} + C H_{4} \to^{∙} C H_{3} + H C l

C l^{∙} + C l^{∙} \to C l_{2}

^{∙} C H_{3} +^{∙} C l \to C H_{3} C l

Q. Consider two alternative mechanism for the chlorination of methane. Which step is crucial in deciding which mechanism is not likely to be observed?
Mechanism I Mechanism II

A ${C l}_{2} ⟶ {2 C l}^{∙}$	A ${C l}_{2} ⟶ {2 C l}^{∙}$
B ${C l}^{∙} + {C H}_{4} ⟶ H C l +^{∙} {C H}_{3}$	D ${C l}^{∙} + {C H}_{4} ⟶ {C H}_{3} C l + H^{∙}$
C $∙ C H_{3} + {C l}_{2} ⟶ {C H}_{3} C l + {C l}^{∙}$	E $H^{∙} + {C l}_{2} ⟶ H C l + {C l}^{∙}$

Q. Select the chain propagation steps in the free radical chlorination of methane.

(1) C l_{2} \to ∙ 2 C l (2) ∙ C H_{3} + ∙ C H_{3} \to C H_{3} - C H_{3} (3) ∙ C l + C H_{4} \to C H_{3} C l + ∙ C l (4) ∙ C H_{3} + ∙ C l \to C H_{3} - C l (5) ∙ C H_{3} + C l_{2} \to C H_{3} - C l + ∙ C l

Q. Consider two alternative mechanisms for the chlorination of methane, Which step is crucial in deciding which mechanism is not likely to be observed?
Mechanism I:

A . C l_{2} \to 2 C l^{*}

B . C l^{*} + C H_{4} \to H C l +^{*} C H_{3}

C . ˙ C H_{3} + C l_{2} \to C H_{3} C l + C l^{*}

D . C l_{2} \to 2 C l^{*}

E . C l^{*} + C H_{4} \to C H_{3} C l + H^{*}

F . H^{*} + C l_{2} \to H C l + C l^{*}

Q. The cholorination of methane may proceed according to one of the two alternative mechanisms (only propagation step are shown). Which statement about these alternative reaction is correct?
Mechanism A:

C l^{*} + C H_{4} \to H C l + H_{3} C^{*}

H_{3} C^{*} + C l_{2} \to H_{3} C C l + C l^{*}

C l^{*} + C H_{4} \to H_{3} C C l + H^{*}

H^{*} + C l_{2} \to H C l + C l^{*}

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