Deduce the index of hydrogen deficiency of ethylamine, C2H5NH2.

Cholesterol has the molecular formula C27H46O.

What is the index of hydrogen deficiency of cholesterol?

Retinal has the molecular formula C20H28O. It contains five C=C double bonds and one C=O bond. How many rings does retinal possess?

A hydrocarbon contains 85.7% carbon by mass. Its 1H NMR spectrum shows two signals in the ratio of 3:1.

Which compound is consistent with this data?

What information can be obtained from the number of peaks in the H NMR spectrum of a compound?

Which region of the electromagnetic spectrum has the longest wavelength?

It is used to identify the bonds in a molecule.

It is used to determine relative atomic and molecular masses.

In a mass spectrum, the fragment with the highest mass belongs to _________.

Its fragment has a mass of 15.

Which of the following can be absorbed by certain nuclei, causing them to reverse their spin?

This causes molecules to increase their rotational energy which gives information about bond lengths.

It causes a bond to stretch or bend.

This technique gives information about the functional groups present in the compound.

Identify the bonds which will produce strong absorptions in the IR region of the electromagnetic spectrum.

I. C - O bond

II. C = C bond

III. C = O bond

The nucleus which is lined up with its magnetic field against the external magnetic field has a lower energy spin state.

Hydrogen nuclei in different chemical environments have different chemical shifts.

It is the standard used in nuclear magnetic resonance spectroscopy.

The H NMR spectrum of a compound exhibits three major peaks and the splitting patterns below.

Chemical shift/ppm Peak area
1.0         --------     3
2.0         --------     3
2.3         --------     2