Question

explain acidic strength order b\w chcl3 chf3 by inductive effect

Answer 1

Here, only CCl3- has effective backbonding and hence the negative charge partially gets stabilised by back donation to the vacant 3dπ orbitals of Cl. Thus, CHCl3 is a stronger acid among them due to 2pπ-3dπ back bonding. ... So, CHF3 is a better acid than CHBr3, and the least acidic is CHI3.

Answer 2

The acidic strength order between the two is $CHCl_{3} > CHF_{3}$ by inductive effect.

• To find the acidic strength of the haloforms, we need to check the relative stabilities of their conjugate bases.
• $CCl_{3}^-, CF_{3}^-$
• Only CCl3- has effective back bonding and hence the negative charge partially gets stabilised by back donation to the vacant 3dπ orbitals of Cl.
• Thus, CHCl3 is a stronger acid among them due to 2pπ-3dπ back bonding.
• $CHCl_{3} > CHF_{3}$