Book cover for Chemistry

Chemistry

Catherine E. Housecroft, Edwin C. Constable

ISBN #9780273715450

4th Edition

995 Questions

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13,222 Students Helped

Homework Questions

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Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This section explores the diversity of molecules essential for life, including carbohydrates (monosaccharides, disaccharides, and polysaccharides), lipids, amino acids, peptides, proteins, and nucleic acids. Understanding their structures and functions provides insight into how biological processes are governed at the molecular level. The formation of complex molecules through processes like dehydration synthesis and peptide bond formation illustrates the intricate connections between structure and function in living organisms.

Learning Objectives

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Key Concepts

CONCEPT

DEFINITION

Acyclic and cyclic alkanes

A discussion of both open?chain (acyclic) and ring (cyclic) saturated hydrocarbons, emphasizing their structural features, nomenclature, conformational behavior (including ring strain and conformation), and the processes used in their interconversion and synthesis.

Example Problems

Example 1

How many stereogenic centres does the following monosaccharide possess? Draw the structures of all the stereoisomers of this molecule, and assign $(R)$ or $(S)$ labels to the stereogenic centres. Which pairs of stereoisomers are enantiomers? Which pairs of stereoisomers are epimers? Give reasons for your answers.

Example 2

Show how the open form of D-ribose undergoes conversion to the furanose form, and comment on why the latter is classed as a hemiacetal.

Example 3

(a) Draw the structure of the pyranose form of D-glucose and comment on what is meant by the anomeric centre. (b) Give a mechanism by which the open form of D-glucose converts to its furanose form, and suggest why this is less favourable than formation of the pyranose form.

Example 4

Suggest products in the following reactions. Give both structures and names for the products: (FIGURE CAN'T COPY)

Example 5

Classify the following sugars as tetroses, pentoses or hexoses, and as aldoses or ketoses: (a) glucose; (b) fructose; (c) ribose; (d) mannose; (e) galactose; (f) threose.

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Step-by-Step Explanations

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Common Mistakes

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