Question

Collecting an FTIR spectrum

a. is a great way to find the molecular weight of a compound

b. is an eaasy wat to determine the carbon backbone of an organic compound

c. is a routine wat to determine the functional groups that are present in a compound

d .requires that the compound is in the gas phase

e. requires the sample to be a solid

Answer 1

ANSWER:

• The correct answer is OPTION-C (i.e.) collecting an FTIR spectrum is a routine work to determine the functional groups that are present in a compound.

FTIR spectrum will only provide the information about the functional groups present in a compound in the form of wave numbers (cm^-1) which are characteristic for each and every functional group such as -OH/-NH will show absorption peaks around 3400 cm^-1 and carbonyl compounds will show absorption peaks around 1720 cm^-1 ± 60 depending on the type of attachment to carbonyl group.

FTIR won’t provide any information about molecular weight (option-A) and also about the carbon backbone (option-B). FTIR sample need not be either a solid (option-E) nor a gaseous sample (option-D) as the sample can be analyzed in the liquid state also.