Question

Which amongst the following is the strongest acid?
(A) CHBr₃ (B) CHI₃
(C) CH(CN)₃ (D) CHCl₃
[JEE Main 2019]

Answer 1

Answer:

CHCl3

Explanation:

This is because there is effective back bonding in CCl3- and hence the negative charge partially gets stabilised by back donation to the vacant 3d orbitals of Cl. Thus, CHCl3 is a stronger acid than others and also due to 2pπ-3dπ back bonding.

Answer 2

CH(CN)3 is the strongest acid.

Option (C) is correct.

Explanation:

Which amongst the following is the strongest acid?

(A) CHBr₃ (B) CHI₃

(C) CH(CN)₃ (D) CHCl₃

Solution:

CH(CN)3 is the strongest acid.

As the conjugate base formed here is stabilized by the mesomeric effect of Cyanide CN.

Therefore we can say that CH(CN)3 is the strongest acid.

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