Knight karplus equation

Question 1

What is the bond angle between synperiplanar substituents

Answer 1

0 degrees

Question 2

What is the bond angle between synclinal substituents

Answer 2

60

Question 3

What is the bond angle between anticlinal substituents

Answer 3

120 degrees

Question 4

What is the bond angle between antiperiplanar substituents

Answer 4

180 degrees

Question 5

What does the 3J coupling constant mean

Answer 5

the coupling constant between hydrogens three bonds apart

Question 6

When is the coupling constant the best

Answer 6

coupling constant is best when the orbital overlap is the best, so best when orbitals are in the same plane

Question 7

What does the larger the 3J value mean

Answer 7

the larger the 3J value the better the orbital overlap

Question 8

When is 3J the largest

Answer 8

largest when the hydrogens are antiperiplanar bond angle 180 degrees

Question 9

When is 3J the smallest

Answer 9

3J is the smallest when the dihedral angle is 90 degrees

Question 10

Which 3J is larger between synperiplanar and anitclinal

Answer 10

Synperiplanar

Question 11

what does the size of 3J also depends on

Answer 11

the nature of the other substituents