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Dinesh khalmaniya 1 Best Answer
first three show +H effect and +H effect decrease from I>II>III and last one i.e., show only +I effect because it's doesn't have any alpha H. we know that Hyperconjugation is dominant over inductive effect. so there are EDG so decrease the acidity but +H is dominant so it decrease more acidity as compair to +I effect. Overall acidiy = IV> III>II>I
got it Anand??