A) \[S{{O}_{2}}\]
B) \[HN{{O}_{3}}\]
C) \[{{H}_{2}}S{{O}_{3}}\]
D) \[HN{{O}_{2}}\]
Correct Answer: C
Solution :
\[{{H}_{2}}S{{O}_{3}}\] has the structure
\[HN{{O}_{2}}\] is a tautometric mixture of its nitrile and nitro forms. 
Hence, it contains coordinate bond.
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