Question

is best represented by two or more resonance forms
a becl2
b so2
c n2
d f2

Explanation:

Resonance occurs when a molecule can be represented by two or more Lewis - structures that differ only in the position of electrons. Sulfur dioxide ($SO_2$) has two resonance forms due to the presence of a double - bond that can be in two equivalent positions around the sulfur atom. Beryllium chloride ($BeCl_2$) has a linear structure with no resonance. Nitrogen gas ($N_2$) has a triple bond and no resonance. Fluorine gas ($F_2$) has a single bond and no resonance.

Answer:

B. $SO_2$