Consider the following pairs of ions 
A) `Sc^(+3) and Ti^(+4)`
B) `Mn^(+4) and Fe^(+2)`
C) `Fe^(+2) and Co^(+3)`
D) `Cu^(+) and Zn^(+2)`
Among these pairs of ions, isoelectronic pairs would include 

Options

A. ii, iii and iv
B. I, iii and iv
C. I, ii and iv
D. I , ii and iii

Answer

B

Explanation

Iso electronic pairs have same no. of electrons.