Spectroscopic Techniques in Organic Chemistry
Chemistry ⇒ Carbon and Organic Chemistry
Spectroscopic Techniques in Organic Chemistry starts at 11 and continues till grade 12.
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A compound absorbs strongly at 285 nm in its UV-Vis spectrum. What does this suggest about its structure?
A compound has a molecular ion peak at m/z = 44 and a base peak at m/z = 29 in its mass spectrum. What is the likely molecular formula of the compound?
A compound shows a singlet at 2.1 ppm in its 1H NMR spectrum. What does this suggest about the environment of the protons?
A compound shows a strong, broad absorption around 3300 cm-1 in its IR spectrum. Which functional group is likely present?
A compound absorbs strongly at 285 nm in its UV-Vis spectrum. What does this suggest about its structure?
A compound has a molecular ion peak at m/z = 44 and a base peak at m/z = 29 in its mass spectrum. What is the likely molecular formula of the compound?
A compound shows a singlet at 2.1 ppm in its 1H NMR spectrum. What does this suggest about the environment of the protons?
A compound shows a strong, broad absorption around 3300 cm-1 in its IR spectrum. Which functional group is likely present?
Which of the following functional groups typically shows a strong absorption near 1700 cm-1 in IR spectroscopy?
(1) Alcohol
(2) Ketone
(3) Amine
(4) Alkene
Which of the following is a limitation of IR spectroscopy?
(1) Cannot distinguish isomers with the same functional groups
(2) Cannot detect non-polar bonds
(3) Cannot be used for solids
(4) Cannot identify molecular mass
Which of the following is NOT a factor affecting chemical shift in NMR?
(1) Electron withdrawing groups
(2) Magnetic field strength
(3) Solvent used
(4) Number of scans
Which of the following is NOT a possible splitting pattern in 1H NMR?
(1) Singlet
(2) Doublet
(3) Triplet
(4) Quartet
(5) Quintet
(6) Sextet
(7) Septet
(8) Octet
(9) Nonet
(10) Decet
In NMR spectroscopy, the splitting of a signal into multiple peaks is called _______.
The absorption maximum (λmax) in UV-Vis spectroscopy for a compound with extended conjugation will be at a _______ wavelength compared to a compound with less conjugation.
The area under a peak in a 1H NMR spectrum is proportional to the _______ of protons giving rise to that signal.
The chemical shift in NMR spectroscopy is measured in _______.
True or False: In IR spectroscopy, the absorption of infrared radiation causes changes in the vibrational energy levels of molecules.
True or False: In NMR spectroscopy, the chemical shift of a proton is affected by the electron density around it.
True or False: In UV-Vis spectroscopy, π→π* transitions generally occur at longer wavelengths than n→π* transitions.
True or False: The base peak in a mass spectrum is always the molecular ion peak.
