Question

The isoelectronic pair is

• A. $Cl _{2} O , ICl _{2}^{-}$
• B. $ICl _{2}^{-}, ClO _{2}$
• C. $IF _{2}^{+}, I _{3}^{-}$
• D. $ClO _{2}^{-}, ClF _{2}^{+}$

Answer 1

Answer: (D)

$ClO _{2}^{-}$and $ClF _{2}^{+}$are isoelectronic species.
Number of electrons in $ClO _{2}^{-}=17+16+1=34$ electrons
Number of electrons in $ClF _{2}^{+}$ $=17+18-1=34$ electrons
[Number of electrons in $Cl =17, O =8, F =9$ ]