In comparison with alkali metals,the electron affinity of halogens is

What is electron gain enthalpy?

Which elements show an anomalous trend in the negative value of electron gain enthalpy within their respective groups?

Which of the following statements is correct?

The electron affinity of chlorine is $3.7 \ eV$. $1 \ g$ of chlorine is completely converted to $Cl^-$ ion in a gaseous state. $(1 \ eV = 23.06 \ kcal \ mol^{-1})$. Energy released in the process is $...... \ kcal$.

Which of the following represents the correct order of electron gain enthalpy (electron affinity) for halogens?