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For the following acids underset((I))(...

For the following acids
`underset((I))((CH_(3))_(3)C CH_(2)CO_(2)H) " " underset((II))((CH_(3))_(3)overset(o+)(N)CH_(2)CO_(2)H) " " underset((III))(CH_(3)COOH)`
`pK_(a)` value will be in order

A

`I gt II gt III`

B

`I lt II lt III`

C

`I gt III gt II`

D

`II gt III gt I`

Text Solution

Verified by Experts

The correct Answer is:
C
`EWG` increases acidic strength
`(-I,-m)`
`EDG` decreases acidic strength
`(I) CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-CH_(2)-COO^(-)`
(II) `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)N^(o+)-CH_(2)-COO^(-)`
`(III) CH_(3)-overset(O)overset(||)-O^(-)`
`pK_(a) prop 1/(K_(a))`
`K_(a) prop` Stability of carboxylate ion.
Stability of ion is `IIgtIIIgtI`
`implies K_(a)IIgtIIIgtI`
`implies pK_(a)IIgtIIIgtI`
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A2Z-SOME BASIC PRINCIPALS OF ORGANIC CHEMISTRY-Section D - Chapter End Test
  1. For the following acids underset((I))((CH(3))(3)C CH(2)CO(2)H) " " u...

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  2. Arrange the following comounds in increasing order of length of their ...

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  3. The order of heat of hydrogenation in following compounds is:

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  4. S(N)1 reaction is faster in

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  5. Which compound would be least soluble in water?

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  6. Among the following compound which can be dehydrated very easily is :

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  7. Which of the follwing is not the characteristic of the mechanism of fr...

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  8. Find the strongest acid among the following compound

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  9. Among the following the dissociation constant is highest

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  10. Which one of the following compounds is most acidic

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  11. The optically active tartaric acid is named as D-(+)- tartaric acid be...

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  12. Among the following compounds (I-II) the correct order of reaction wit...

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  13. The following reaction is described as

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  14. Which of the following is the most stable cation?

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  15. The observed dipole moment of nitromethane is highly than the dipole m...

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  16. Dehydrohalogenation in presence of OH^(-) is correct represented by

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  17. Among the following the aromatic compound is

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  18. Which of the following compounds are not arranged in order of decreasi...

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  19. Most stable carbonium ion is :

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  20. Which one of the following species is most stable

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  21. Which of the following gives most stable carbocation by dehydration

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