Question

Which is the correct order of increasing ionic nature of following molecules?
I. $LiF$
II. $Cl{F}_3$
III. $K_{2}O$
IV. ${SO}_2$

• A. II< I< IV< III
• B. II< IV< I< III
• C. II< IV< III< I
• D. IV< II< I< III

Answer 1

The correct option is D IV< II< I< III

The key here is that there are 3 F atoms in $Cl{F}_3$ and only two $O$ atoms in $S{O}_2.$ and we know the difference b/w the electronegativity of F and $O$ is bit high.so definitely $Cl{F}_3$ will be more ionic than $S{O}_2.$

After arranging we get

$S{O}_2<Cl{F}_3<LiF<K_{2}O$

$Cl{F}_3$ is more ionic than $S{O}_2$