Nuclear Magnetic Resonance Spectroscopy

Question 1

Energy in NMR

Answer 1

Radio frequency

Question 2

A nucleus is in ____ when it absorbs RF radiation and spin flips to a higher energy state

Answer 2

Resonance

Question 3

NMR absorptions appear as sharp peaks

Answer 3

True

Question 4

External standard used in NMR is a volatile and inert compound that gives a sibgle peak upfield from other typical absorptions

Answer 4

Tetramethylsilane

Question 5

The number, position, intensity, and spin-spin splitting of signals found in an NMR spectrum provide information about the ____ of a compound

Answer 5

Structure

Question 6

A set of non equivalent protons splits the signal of nearby proton into n+1 peaks. _____ is observed for non-equivalent protons on the same carbon or adjacent carbons.

Answer 6

Spin-spin splitting

Question 7

Loosely held π electrons can either shield (NMR signal appears ____) or deshield (NMR signal appears ____) a nucleus.

Answer 7

Upfield, downfield