Lecture Quiz

Question 1

Dextrorotatory =

Levorotatory =

Racemic Mixture =

Answer 1

Dextrorotatory = (+) isomer

Levorotatory = (-) isomer

Racemic Mixture = 50/50 mixture of enantiomers. No net reaction occurs due to enantiomers cancelling.

Question 2

What determines if the molecule is D-Glucose or L-Glucose?

Answer 2

The placement of the OH at the bottom of the structure.

Question 3

What is this structure called?

Answer 3

D-Ribose

FYI: R = Right(OH)

Question 4

What is this structure called?

Answer 4

2-Deoxyribose

FYI: deoxy = Remove oxygen

Question 5

What is this structure called?

Answer 5

D-Galactose

FYI: R.L.L.R

Question 6

What are the names of these two structures and how do they differentiate?

Answer 6

F-Fructose

FYI: Similar to Glucose. =O.L.R.R

D-Glucose

FYI: R.L.R.R

Question 7

D-Ribose

Answer 7

D-Ribose

Question 8

2-Deoxyribose

Answer 8

2-Deoxyribose

FYI: No oxygen(deoxy)

Question 9

D-Glucose

F-Fructose

Answer 9

Left = F-Fructose

=O.L.R.R

Right = D-Glucose

R.L.R.R

Question 10

D-Galactose

Answer 10

D-Galactose

R.L.L.R