The order of acidity of the protons H in each of the following is:


  • a)
    I > II > III
  • b)
    II > III > I
  • c)
    I > III > II
  • d)
    III > I > II
Correct answer is option 'C'. Can you explain this answer?

Chemistry Question

By Gaurav Shebe · Dec 26, 2018 ·Chemistry
4 Answers
Jakir Ahmed answered Sep 16, 2018
We know (alfa H) of aldehyde is more acidic then ester, as ther is +R effect of -OMe group in ester, it decreases the electron withdrawing power of carbonyl group.for second case it is ester.but for 3rd case, the (alfa H) is attached with two carbonyl group.
so the order of acidity is ¡>¡¡¡>¡¡

Arjun Datta answered Dec 26, 2018
In option I metyle proton has high acidity due to presence of EWG CHO gr and aslo no cross conjugation present so that conjugate base is most stable... option III formed a six member chete ring so that 2nd high acidity...but in option II cross conjunction as well as no formation of chelation so that least acidic

Jardik Thumar answered Aug 06, 2018
Ok

Cheruvu Mahammad Siraj answered May 24, 2019
Hydrogen attached to the carbon which is attached to more electron with drawing group is more acidic

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