MCQ
Each of the following options contains a set of four molecules. Identify the option($s$) where all four molecules possess permanent dipole moment at room temperature.
$(1)$ $BeCl _2, CO _2, BCl _3, CHCl _3$
$(2)$ $SO _2, C _6 H _5 Cl , H _2 Se , BrF _5$
$(3)$ $BF _3, O _3, SF _6, XeF _6$
$(4)$ $NO _2, NH _3, POCl _3, CH _3 Cl$
- A$1,2$
- B$1,3$
- C$1,4$
- ✓$2,4$
