Among the given protonated form of the histidine residue, A or B, the more stable form has to be identified. Concept introduction: The organic compounds that contain amine ( -NH 2 ) and carboxyl ( -COOH ) functional groups with a side chain ( -R ) are known as amino acids. Amino acids consist of both positive as well negative groups in their structure and are called as ampholytes. The organic compounds that consist of a cyclic and planar ring structure with alternate single and double bonds are called as aromatic compounds . Aromatic compounds follow the Huckel ( 4 n + 2 ) rule of aromaticity that is the compound has 4 n + 2 π electrons.

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Chapter 26, Problem 33P

Interpretation Introduction

Interpretation: Among the given protonated form of the histidine residue, A or B, the more stable form has to be identified.

Concept introduction:

The organic compounds that contain amine (-NH2) and carboxyl (-COOH) functional groups with a side chain (-R) are known as amino acids.

Amino acids consist of both positive as well negative groups in their structure and are called as ampholytes.

The organic compounds that consist of a cyclic and planar ring structure with alternate single and double bonds are called as aromatic compounds.

Aromatic compounds follow the Huckel (4n+2) rule of aromaticity that is the compound has 4n+2 π electrons.

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