Fluorine has higher electronegativity but less electron gain enth… - Vidyadip

Question

Fluorine has higher electronegativity but less electron gain enthalpy. Explain.

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Answer

Halogens have the highest values for electronegativity due to their small atomic radii and high nuclear charge.
Fluorine has the highest electronegativity due to its small size.
In fluorine due to strong inter electronic repulsions in the relatively small 2p orbitals and higher electron density, there is not much attraction of the nucleus for the incoming electron.
Thus the electron gain enthalpy of fluorine is less in spite of higher electronegativity.

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$\begin{aligned}
& CHCl _{3( g )}+ Cl _{2( g )} \rightarrow CCl _{4( g )}+ HCl _{( g ),} \\
& \text { Rate }= k \left[ CHCl _3\right]\left[ Cl _2\right]^{1 / 2}
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