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Fluorination

Direct Fluori...

Question

Direct Fluorination of methane is a laboratory is Violently explosive. This is because the chain - initiation and Chain -Propagation steps are highly exothermic

A

True

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B

False

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Solution

The correct option is B
False

The overall heat of reaction in the chain propagation step is highly exothermic.

But, the chain initiation step for all of $F_{2}, C l_{2}, B r_{2} a n d l_{2}$ are endothermic

$F_{2} ⟶ 2 \cdot F △ H^{\circ} = + 159 k J . m o l^{- 1}$

$C l_{2} ⟶ 2 \cdot C l △ H^{\circ} = + 243 k J . m o l^{- 1}$

$B r_{2} ⟶ 2 \cdot B r △ H^{\circ} = + 193 k J . m o l^{- 1}$

$I_{2} ⟶ 2 \cdot I △ H^{\circ} = + 151 k J . m o l^{- 1}$

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Q. Halogenation takes place by free-radical mechanism. The values of

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for chain initiation and chain propagation steps and enthalpy of overall reaction of halogens with alkane are given. Match the values with the type of halogens.

Q. Which of the statements is/are true about the reactivity order of halogens

F_{2} > C l_{2} > B r_{2} > I_{2} .

I. Lower the activation energy for the chain initiation step, more reactive is the halogen.
II. Lower the activation energy for the first chain propagation step, more reactive is the halogen.
III. More negative is the overall heat of the reaction

(Δ H_{r})

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IV. Lower the activation energy for the second chain-propagation step, more reactive is the halogen.

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