Question

For the compounds,
I) HCOOH  II)   III)   IV)  
The correct order of decreasing acidity is :

A

I > II > III > IV

B

IV > I > II > III

C

I > IV > II > III

D

IV > II > III > I

Hard

Solution

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Correct option is C)

To see the strength of acid here need to compare stability of conjugate bases of these acids. Higher effect of alkyl group makes least stable.

Presence of more electronegative atom stabilizes the negative charge.

hybridized carbon shows a weaker effect as compared carbon. Hence phenyl group is more electronegative as compared to (methyl group) but still less electronegative than hydrogen.

So, summarizing, the electronegativity order of the three substituents is .

Therefore the acidity order is .

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