Consider the proton-coupled carbon-13 (13C) NMR spectrum of sodium trimethylsilylpropanesulfonate (DSS), a common internal chemical shift standard used in NMR studies of proteins. DSS has the molecular structure (CH3)3Si-CH2-CH2-CH2-SO3-Na+, where the carbons can be sequentially labeled from the silicon side to the sulfonate side. In a fully proton-coupled 13C spectrum, peak splitting occurs due to 1H-13C coupling. Which of the following represents the correct assignment of the NMR peaks (labeled 1 to 4 based on increasing chemical shift, i.e., from right to left or upfield to downfield) to the respective carbon atoms of DSS?

Consider the formation of triiodide ion I3−: I2 + I− → I3−. What is the correct relative order of the symmetric I−I stretching frequency νI−I for: (A) free I2, (B) I3−, and (C) I3− in an adduct with extra I− interactions?

Match the physical methods in Column I with the correct combinations in Column II (region/constant) and Column III (application): a. Electron Paramagnetic Resonance spectroscopy b. Nuclear Magnetic Resonance spectroscopy c. Resonance Raman spectroscopy p. Radio frequency q. Force constant r. Microwave i. nature of O2 bound to haemoglobin ii. d-block metals with odd number of unpaired electrons iii. fluxionality in organometallic compounds