Topic 21

Question 1

IHD formula

Answer 1

IDH =1/2 (2c + 2 - h - x + n)

Question 2

What does IHD 1-4 mean

Answer 2

1) 1 double bond/ring
2) 1 triple bond/ring and 2 double bond
3) 1 triple and double, 3 double
4) Benzene

Question 3

If they ask for splitting pattern what are they asking?

Answer 3

Singlet (1 signal), doublet, triplet

Question 4

signal vs peak

Answer 4

signal is number of proton environments, peak is on the spectroscopy number of lines

Question 5

Singlet, doublet, triplet, quartet

Answer 5

Singlet - next to C (no H)
Doublet - next to CH
Triplet - next to CH2
Quartet - next to CH3

Question 6

How many proton environments does propanol have?

Answer 6

4

Question 7

What is the n + 1 rule

Answer 7

When given compound, number of hydrogens will produce plus one peak on spectrum

applies to peaks not signals

Question 8

Why is TMS used as reference standard?

Answer 8

Chemical shift is outside range of common chemical shifts

All protons in same environment so singlet

Volatile so easily separated, inert (does not react with other compounds)