Isomers

Question 1

What 3 factors cause ring strain to arise ?

Answer 1

Angle strain: bond angles deviate from standard by being stretched or compressed
Torsional strain: cyclic molecules assume confirmations that are gauche or eclipsed
Non-bonded (steric) strain: nonadjacent atoms or groups compete for same space

Question 2

What’s the difference between chiral & achiral ?

Answer 2

C: non superimposable
A: superimposable

Question 3

A compound that rotates the plane of polarized light to the right (clockwise) is ?
A compound that rotates the plane of polarized light to the left (counterclockwise) is ?

Answer 3

Dextrorotatory (d)(+)

Levorotatory (l)(-)

Question 4

What is the standard specific rotation equation ?

Answer 4

[A] = Aobs/c x l
[A]: specific rotation in degrees
Aobs: observed rotation in degrees
c: conc. (g/mL)
l: length (dm)