Increasing order of stability is

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I < III < II < IV

IV < III < II < I

III < IV < II < I

II < IV < III < I

answer is B.

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Detailed Solution

Resonance rules:→ The structure in which all the atoms having octet configuration is more stable.→ More electronegative atom (Eg. Oxygen)carries negative charge is more stable.→ More electronegative atom carries +ve charge is highly unstable→ Less electronegative atom (Eg. carbon) carries positive charge is more stable and less electronegative atom carries -ve charge is unstable→ Wothout chage resonance structures are more stable than the charge containing resonance structures.→ Single charge resonance structure are more stable than the charge saperated resonance structures→ Like charges closer to each other is unstable than the like charges far away from each other→ Opposite charges close to each other is stable than the opposite charges far away from each other.Based on the above rulesThe increasing order of stability isIV < III < II < I

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