Exam 10: Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

Circle any of the following compounds that would be a candidate to produce a UV absorption spectrum.

Which of the following bonds undergoes stretching at the highest frequency?

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation.High energy radiation,like gamma rays,is of:

Examining the infrared spectrum of a compound allows us to:

Below is the mass spectrum of an unknown hydrocarbon.In addition,this hydrocarbon shows characteristic absorption at 2100 cm^-1 in its IR spectrum.Give the structure of this unknown. (Spectrum obtained from:SDBSWeb:http://www.aist.go.jp/RIODB/SDBS/)

Match each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. -

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (sharp peak)and 2150 cm^-1 (sharp peak)?

Which of the following compounds gives an infrared spectrum with a peak at strong 1730 cm^-1?

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm^-1 and ~1750 cm^-1?

What is the vertical axis of a mass spectrum?

Instructions: Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s). (Spectrum obtained from:SDBSWeb:http://www.aist.go.jp/RIODB/SDBS/) -Refer to instructions.What peak represents M⁺?

Which of the following compounds would have the longest l_max in the UV region of the electromagnetic spectrum?

Loratidine is the active ingredient in the antihistamine Claritin.Mass spectral analysis of loratidine shows M⁺ at m/z = 382.Loratidine is known to contain nitrogen.What is the minimum number of nitrogens in loratidine?

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm^-1 or 1600-1680 cm^-1?

Arrange the following in order of increasing energy. A.3842 nm B.2870 cm^-1 C.2.91 ´ 10¹⁶ Hz D.1.99 ´ 10^-18 J

Assume you are carrying out the conversion of 1-bromobutane to butan-1-ol.How could you use IR spectroscopy to determine when the reaction is complete?

The source of absorbance of light at a wavelength of 6600 nm would be:

What region of the IR spectrum would be the most useful in distinguishing between the following two compounds?

Which type of spectroscopy (IR,UV,or MS)will best distinguish between the pair of compounds below? Give a brief reason.

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (strong,broad peak)and 1640 cm^-1 (sharp,weak peak)?