# The correct order of the first ionization enthalpies is :

Question:

The correct order of the first ionization enthalpies is :

1. $\mathrm{Ti}<\mathrm{Mn}<\mathrm{Zn}<\mathrm{Ni}$

2. $\mathrm{Ti}<\mathrm{Mn}<\mathrm{Ni}<\mathrm{Zn}$

3. $\mathrm{Mn}<\mathrm{Ti}<\mathrm{Zn}<\mathrm{Ni}$

4. $\mathrm{Zn}<\mathrm{Ni}<\mathrm{Mn}<\mathrm{Ti}$

Correct Option: , 2

Solution:

I.E. increases on moving left to right in a period.

$\therefore \mathrm{Ti}<\mathrm{Mn}<\mathrm{Ni}<\mathrm{Zn}_{\text {, }}$