Which statement correctly describes the physical principles or observations associated with the analytical techniques used to study alcohols, haloalkanes, and atmospheric gases?
In infrared spectroscopy, the absorption of radiation by a covalent bond causes electronic transitions, exciting bonding electrons to higher energy levels.
In the mass spectrum of a monobromoalkane, the molecular ion peak appears as two peaks of approximately equal intensity, separated by two mass-to-charge (m/zm/zm/z) units.
Greenhouse gases like carbon dioxide and methane contribute to global warming by absorbing incoming high-energy ultraviolet radiation directly from the Sun.
During fragmentation in a mass spectrometer, a molecular ion breaks down into a positive ion and a free radical, both of which are deflected by the magnetic field and detected.
3 exam-style questions on OCR A A Level Chemistry Analytical techniques. Each one has a worked solution and a mark scheme showing where the marks go.