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?

Question

The order of acidity of the protons H in each of the following is:a)I > II > IIIb)II > III > Ic)I > III > IId)III > I > IICorrect answer is option 'C'. Can you explain this answer?

Answer

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 ¡>¡¡¡>¡¡

Answer

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 ¡>¡¡¡>¡¡

Answer

This can be explained on the basis of  stability  of conjugate  base  formed . The conjugate base of 1 is more stable by  then conjugate base of 3rd str is more stable and conjugate base of 2nd structure is least stable. so correct option is C .

Answer

Aldehyde are more acidic than peroxy molecules due to resonance stabilization that is why acetaldehyde (l) is most acidic. and in third there is two EWG i.e., carbonyl group are present and hence (lll) is more acidic then (ll). So overall order will be (l)>(lll)>(ll).

Answer

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

Answer

Well in my opinion the correct ans should be d. after deprotonated compound 3 show more no of conjugated structure because there are two carbonyl group attached to it. and compound 2 is less acidic than 1 because acidity order of 2 is decreased by +R effect of O atom.

Answer

Hydrogen attached to the carbon which is attached to more electron with drawing group is more acidic

Answer

Ok

Answer

I,III,II is the correct order, because in the 1st the proton removes easily 3rd there is two electron withdrawing group and 2nd only one is present.

Answer

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 ¡>¡¡¡>¡¡

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