Which of the following statements is incorrect ?

I…. most stable …… All atoms possess octet and no charge separation.II, III …… Equally stable  but less stable than I because of charge separation (Both structures have octet on all atoms)(1) …. Correct …… CH4109.280   >   NH31070  >  H2O1050  >   H2S920 (2) …. Correct ……  O2+2.50   >   O22  >  O2−1.5  >   O2−21(3) …. Correct …… HF > H2O > NH3 > HClPolarity of H – F > H – O > H – N