Question

Which one of the following have a linear structure?

• A. ${I_3}^{-}$
• B. $N{O}_2$
• C. $I_3^{+}$
• D. $S{O}_2$

Answer 1

Answer: (A)

${I_3}^{-}$

$I_3^{-}$ has $s{p}^{3}d$ hybridisation on central atom with 3 lone pairs and 2 bond pairs of electrons. The electron pair geometry is trigonal bipyramidal and molecular geometry is linear.

$I_3^{+}$ has $s{p}^3$ hybridisation on central atom with 2 lone pairs and 2 bond pairs of electrons. The electron pair geometry is tetrahedral and molecular geometry is bent or V shaped or angular.

$S{O}_2$ has $s{p}^2$ hybridisation on central atom with 1 lone pair and 2 bonding domains of electrons. The electron pair geometry is trigonal palnar and molecular geometry is bent or V shaped or angular.

$N{O}_2$ has $s{p}^2$ hybridisation on central atom with 1 unpaired electron and 2 bonding domains of electrons. The electron pair geometry is trigonal palnar and molecular geometry is bent or V shaped or angular.

Hence, option A is correct.