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Q.
The lowest $ p{{K}_{a}} $ value is for
VMMC MedicalVMMC Medical 2012
Solution:
The value of $ p{{K}_{a}} $ is minimum for the strongest acid. In the given compounds phenol is the strongest acid because in cresol electrons releasing group (i.e., $ C{{H}_{3}} $ ) reduces the stability of phenoxide ion and therefore, acidic nature of cresol reduces. Hence, phenol has the lowest $ p{{K}_{a}} $ value (because maximum value of $ {{K}_{a}} $ )