MyQuestionIcon

2

You visited us 2 times! Enjoying our articles? Unlock Full Access!

Nomenclature

Consider two ...

Question

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:
$A . C l_{2} \to 2 C l^{}$
$B . C l^{} + C H_{4} \to H C l +^{} C H_{3}$
$C . ˙ C H_{3} + C l_{2} \to C H_{3} C l + C l^{}$
Mechanism II:
$D . C l_{2} \to 2 C l^{}$
$E . C l^{} + C H_{4} \to C H_{3} C l + H^{}$
$F . H^{} + C l_{2} \to H C l + C l^{*}$

A

I

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

I I

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

C

I

and

I I

both

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

None

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B $I I$
In chlorination of methane in presence of sunlight is the free radical mechanism where chain elongation step is rate determining step. For that formation of $C l^{}$ free radical is crucial.
Chain elongation process-
$C l_{2} + C H_{3}^{} \to C H_{3} C l + C l^{*}$

Suggest Corrections

thumbs-up

0

Similar questions

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. 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. 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^{*}

Q. Which of these steps are part mechanism for chlorination of ethane under free radical conditions?

I : C H_{3} C H_{3} + C l^{*} \to C H_{3} C H_{2} C l + H^{*}

I I : C H_{3} C H_{3} + C l^{*} \to C H_{3} C H_{2}^{*} + H C l

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

I V : 2 C l^{*} \to C l_{2}

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

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Classification of Halocompounds

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon