(a) Interpretation: The carbonyl compound in given pair that exhibits the higher percentage of the enol tautomer is to be identified. Concept introduction: Tautomers are isomers which differ only in the position of the hydrogen and electrons of the electronegative atom, generally oxygen. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism. The very common example of tautomerism is Keto-enol tautomerism. It can be acid or base catalysed. The very common example of tautomerism is Keto-enol tautomerism. It can be acid or base catalyzed. Formation of predominant product is determined by several factors.

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Lewis Structure, Hybridization & Molecular Geometry a) Draw the Lewis Structure of the molecules; Label the hybridization of each carbon atom; Predict the approximate molecular geometry around each carbon atom. CH3CHO CH3CN b) Draw the Lewis Structure of Nitromethane; Predict the approximate molecular geometry around the nitrogen atom. CH3NO2 c) Draw the Lewis Structure; Label the hybridization of the boron atom; Predict the approximate molecular geometry. BF3 BF4

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Chapter 21, Problem 33P

Interpretation Introduction

(a)

Interpretation: The carbonyl compound in given pair that exhibits the higher percentage of the enol tautomer is to be identified.

Concept introduction: Tautomers are isomers which differ only in the position of the hydrogen and electrons of the electronegative atom, generally oxygen. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

The very common example of tautomerism is Keto-enol tautomerism. It can be acid or base catalysed.

The very common example of tautomerism is Keto-enol tautomerism. It can be acid or base catalyzed. Formation of predominant product is determined by several factors.

Interpretation Introduction

(b)

Interpretation: The carbonyl compound in given pair that exhibits the higher percentage of the enol tautomer is to be identified.

Concept introduction: Tautomers are isomers which differ only in the position of the protons and electrons of the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.The very common example of tautomerism is Keto-enol tautomerism. It can be acid or base catalyzed. Formation of predominant product is determined by several factors.

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