Solve this:
Q. In which of the following sets do all the three compounds have bonds that are mainly ionic ?
(1) NaCl, NCl3 , CCl4
(2) CsBr , BaBr2 , SrO
(3) CsF , BF3 , NH3
(4) Al2O3 , CaO , SO2
Option 2 is having all compounds ionic. The reason is the electronegativity difference between the two atoms are higher in this category.