Problem 2
(a) Outline the reasons why it is necessary to use deuterated solvents in \(^{1} \mathrm{H}\) NMR spectroscopy. (b) Draw the structures of THF- \(d_{8}\) and DMF- \(d_{7}\)
Problem 4
In \(^{1} \mathrm{H}\) NMR spectra in which the solvent is acetonitrile- \(d_{3}\) labelled to an extent of \(99.6 \%\), a multiplet is observed at \(\delta\) 1.94. How does this multiplet arise, and what is its appearance? \(\left[\mathrm{D}, I=1 ; \mathrm{H}, I=\frac{1}{2}\right]\)
Problem 6
The IR spectrum of a \(0.01 \mathrm{mol} \mathrm{dm}^{-3}\) solution of tertbutanol in \(\mathrm{CCl}_{4}\) shows a sharp peak at \(3610 \mathrm{cm}^{-1} ;\) in the IR spectrum of a similar \(1.0 \mathrm{mol} \mathrm{dm}^{-3}\) solution, this absorption is much diminished in intensity, but a very strong, broad peak at \(3330 \mathrm{cm}^{-1}\) is observed. Rationalize these observations.
Problem 7
Suggest an explanation for the fact that solid CsCl, but not LiCl, absorbs HCl at low temperatures.
Problem 8
Suggest a structure for the \(\left[\mathrm{H}_{9} \mathrm{O}_{4}\right]^{+}\) ion.
Problem 9
Write a brief, but critical, account of 'the hydrogen bond'.
Problem 10
(a) Write equations for the reactions of KH with \(\mathrm{NH}_{3}\) and with ethanol. (b) Identify the conjugate acid-base pairs in each reaction.
Problem 11
Write equations for the following processes, noting appropriate conditions: (a) electrolysis of water; (b) electrolysis of molten LiH; (c) \(\mathrm{CaH}_{2}\) reacting with water; (d) \(\mathrm{Mg}\) treated with dilute nitric acid; (e) combustion of \(\mathrm{H}_{2}\) (f) reaction of \(\mathrm{H}_{2}\) with \(\mathrm{CuO}\).
Problem 12
Solutions of \(\mathrm{H}_{2} \mathrm{O}_{2}\) are used as bleaching agents. For the decomposition of \(\mathrm{H}_{2} \mathrm{O}_{2}\) to \(\mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{O}_{2}\) \(\Delta G^{0}=-116.7 \mathrm{kJ} \mathrm{mol}^{-1} .\) Why \(\operatorname{can} \mathrm{H}_{2} \mathrm{O}_{2}\) be stored for periods of time without significant decomposition?
Problem 15
Discuss the bonding in \(\mathrm{BeH}_{2}\) in terms of a suitable hybridization scheme. Relate this to a bonding description for \(\mathrm{Ga}_{2} \mathrm{H}_{6}\)
