The most acidic and least acidic labeled H atoms are to be identified by considering A and B compounds, and an explanation for the choices is to be stated. Concept introduction: The strength of acid depends upon the stability of conjugate base formed by the abstraction of proton by base. A planar, cyclic, completely conjugated compound that has 4 n + 2 π electrons is aromatic . A planar, cyclic, completely conjugated compound that has 4 n π electrons is antiaromatic. The aromatic conjugate base is more stable than the nonaromatic and an antiaromatic conjugate base (least stable).

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Chapter 15, Problem 45P

Interpretation Introduction

Interpretation: The most acidic and least acidic labeled H atoms are to be identified by considering A and B compounds, and an explanation for the choices is to be stated.

Concept introduction: The strength of acid depends upon the stability of conjugate base formed by the abstraction of proton by base. A planar, cyclic, completely conjugated compound that has 4n+2 π electrons is aromatic. A planar, cyclic, completely conjugated compound that has 4n π electrons is antiaromatic. The aromatic conjugate base is more stable than the nonaromatic and an antiaromatic conjugate base (least stable).

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