Knight content L11-15

Question 1

What is the requirement for chirality

Answer 1

a molecule must have a non-superimposable mirror image

Question 2

What are the 3 types of chirality

Answer 2

Central chirality
Axial chirality
Planar chirality

Question 3

What does central chirality arises due to due to

Answer 3

central chirality arises due to the presence of one or more chiral centres

Question 4

What does axial chirality arise due to

Answer 4

axial chirality arises due to the presence of a chiral axis that can also be thought of as helicity

Question 5

What does planar chirality arises due to

Answer 5

planar chirality arises due to the presence of a chiral plane

Question 6

In what circumstance is alkenes chiral And why

Answer 6

Alkenes have two contiguous c=c. The two systems are othogonal and as a result the substituents on the two ends of the alkene are in different planes. Alkenes are chiral provided R1 is not equal to R2 or R3 is not equal to R4

Question 7

Describe compounds with cumulative double bonds

Answer 7

if there is an odd number of double bonds the may possess cis-trans isomerism, if there is an even number of double bonds then they may possess chirality