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Q.

Select the correct pKa orders for the following compounds

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a

IV < III < II < I

b

IV < I I< III < I

c

III < IV < II < I

d

III < II < I < IV

answer is D.

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Detailed Solution

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Based on Pka values. Pka value ↓ ⇒ ↑ of acidic nature. The order of Pka will be: III < III < I < IV.

Acidity increases if 
1. More minus I effect is present.
2. The resulting ion is stable.
3. The proton is donated fast.
4.Conjugate base must be stable.

The general order of acidity is,
Sulphonic acid>RCOOH>Phenol>Water>Alcohols>1,3 diketones>yne>ene>ane
Plus I effect decreases acidity.

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