Lecture 3

Question 1

Monosaccharides are..

Answer 1

Simple sugars that cannot be broken down to form more simple groups

Question 2

Glyceraldehyde

Answer 2

• chiral substance
• will prolly ask u to draw ficher projection

Question 3

How to find stereoisomers

Answer 3

2 to the power of the number of chiral carbons

Question 4

If a molecule contains both c=o and OH functional groups then it can…

Answer 4

Form a cyclic hemiaceltyl

Question 5

FURANOSE

Answer 5

• common monosaccharide in cyclic hemiacetal forms
• 4 carbons
• 4 member end ring

Question 6

Pyranose

Answer 6

• common monosacride that exists in the cyclic hemiacetly form
• 5 carbons
• 6 members ring

Question 7

Glucose

Answer 7

• one of the most abundant monosaccharides
• naturally found in two cyclic hemiacetly forms - a and b D-glucose

Question 8

Difference between glucose and other aldohexoses

Answer 8

• stereochemistry at any of:
  
  • c-2,3,4,5

Question 9

Glucose in solution

Answer 9

• may be obtained for either a or b D-glucopyranose
• in aqueous solution these interconvert via a chain form
• cyclic forms are in equilibrium with free aldehyde
• re-closure can take place with c-1 OH either up or down
• ROTATION ABOUT C1-C2
• this process is called mutarotation

Question 10

Polarised light shit

Answer 10