(a) Write balanced equations for the reactions of aqueous Ga⁺ with [I₃]‾ , Br₂, [Fe(CN)₆]³⁺ and [Fe(bpy)₃]³⁺.

(b) The ²⁰⁵Tl NMR spectrum of an acidic solution that contains Tl³⁺ and 13C-enriched [CN]^– ions
in concentrations of 0.05 and 0.31 mol dm^–3 respectively shows a binomial quintet (δ 3010 ppm, J = 5436 Hz) and quartet (δ 2848 ppm, J = 7954 Hz). Suggest what species are present in solution and rationalize your answer. (See Table 4.3 for nuclear spin data.)

Table 4.3.

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Nucleus ΤΗ 2H Li 11B 13C o a 170 19 F 23 Na Al 29 Si 31 p Ti Se 103 Rh 117 Sn 119 Sn 129 хе 183 W 195 Pl 199 Hg Natural abundance/% >99.9 0.015 92.41 80.1 1.07 0.04 100 100 100 4.69 100 7.63 100 7.68 8.59 26.40 14.31 33.78 16.87 mlemler -le VINN ok ---le-le --kk-k -IN Frequency of observation / MHz (referred to ¹H at 100 MHz) 100 15.35 38.9 32.1 25.1 13.5 94.0 26.45 26.1 19.9 40.5 19.1 3.2 35.6 37.3 27.7 4.2 21.5 17.9 Chemical shift reference (8 0 ppm) SiMe SiMc4 LICI (1 M in H₂O) F₂B-OEt₂ SiMc4 H₂O CFC13 NaCl (1 M in H₂O) [Al(OH₂)]³+ SiMe4 H3PO4 (85%, aq) SeMe₂ Rh (metal) SnMe4 SnMe4 XeOFA Na₂ WO4 (in D₂O) Na₂ [PtCl6] HgMc₂