Question

Arrange Cl, F, $F^{-},C{l}^{-}$ in increasing order of ionisation potential.

• A. $F^{-}<C{l}^{-}<Cl<F$
• B. $C{l}^{-}<F^{-}<F<Cl$
• C. $C{l}^{-}<F<F^{-}<Cl$
• D. $F^{-}<C{l}^{-}<F<Cl$

Answer 1

The correct option is A $F^{-}<C{l}^{-}<Cl<F$

Fluorine has its valence electrons in 2p orbital while chlorine has 3p so there is more atomic force of attraction in fluorine than chlorine, therefore, the ionisation potential of fluorine is more than chlorine.

Hence, the correct option is $\text{A}$