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

True

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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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