Which of the following molecules exhibit resonance?
I. $A s F_{5}$
II. $H N O_{3}$
III. $S O_{2}$

I only

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II only

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II and III

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III and IV

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I, II, and III

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Solution

The correct option is C II and III
$A s F_{5}$ does not exhibit resonance; the fact being
(i) There are no double Bonds
(ii) The lone pairs of electrons on the Fluorine atom doesnot take part in resonance

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