Which of the following molecules is/are polar?
(i)
(ii)
(iii)
(iv)
(v)

Question

Which of the following molecules is/are polar?
(i) 
(ii) 
(iii) 
(iv) 
(v)

Quizplus · Accepted Answer

The best way to determine if a molecule is polar is to look at the symmetry of the molecule and the differences in electronegativity between the atoms. If the molecule has a symmetrical structure and the electronegativities of the atoms are the same, the molecule is nonpolar. If the molecule has an asymmetrical structure and the electronegativities of the atoms are different, the molecule is polar.

(i) This molecule has a symmetrical structure and the electronegativities of the atoms are the same, so it is nonpolar. 
(ii) This molecule has an asymmetrical structure and the electronegativities of the atoms are different, so it is polar. 
(iii) This molecule has an asymmetrical structure and the electronegativities of the atoms are different, so it is polar. 
(iv) This molecule has an asymmetrical structure and the electronegativities of the atoms are different, so it is polar. 
(v) This molecule has an asymmetrical structure and the electronegativities of the atoms are different, so it is polar.

Therefore, the only polar molecules are (ii) and (v), so the answer is E.

Which of the Following Molecules Is/are Polar