Question

1. Determine the number of Infrared and Raman active bands for the following compounds. В С. A B с В (a) (b) 2. a) Build the molecular orbital energy diagram for the following molecules, O 2 ,02+ and O 2 -. b) Calculate the bond order for the three molecules, and justify which one is more stable. 3. How many unpaired electrons would you expect for the following complexes: [CoCle], [Cr(NHs)e]9 and [Cr(H2O)e3? 4. KMnO4 was expected to show no absorption bands at all. But, surprisingly potassium permanganate has a strong absorption band. Why? 5. Suggest a reason why zinc(II) compounds are often coloriess. Spectrochemical series: CO CN phen> NO2> en> NH3> NCS > H20> F- > RCOO > OH > Cl> Br>

Answer 1

Molpoule Moleculare orebital diagream of Oo. Ogt, and Og nu I 1117 A , N Talo Tape -114 oape 1V Eneregy IS HS (Tore o rolecule) Lost Molecule) Thalal 477K Phone I Molecule) Scanned with CamScanner

Talle jos Fore O rolecule, it contains 16 electrons. So, tc (Tisho (s) ( Tas do verp(italu). (Tapy )'(78914 ) Bond oredere a No-Na 8.4 od Fore or le containe is electrone) Gus ja ) [capat tap, ya Tano y(nr 98.)' - Bond orederes ny. Na = 83 - 8 = 2.5 Fore Og (se contains of electrone ? Les gorengo la segona po apy" (tha Dia Ja Tap, J*{n°3 Dua)' Bond orester 5 Mp yang sering en 4-5 Among all the above molecules oot is more stable. Because according to moleculare orebital theory ogt has 15 electrons present. It contains an antibonding electron, is situated in antibonling orbital of number of electrons more in antibonding orbital, the molecule is more stabl Sll zinc has no unpaired electrons, in a stable fully filled orebital-d. Hence, due to absence of unpaired electrons an(11) compounds are Often colourless.. CamScanner

1 3 Number of unpaired electrons - In the compound, (che Holyst - The electronic configureation of west is 42 Gharam XX 460 460 Ho Ho Ho 4/20 Hybridisation - caspa - No. of unpaired electrons : & (1) In [ch (NH) ayat, the electronic configereation is. - Ma NH3 rito MHz Mile NH3 . 1. The no. of unpained eo is 3 x (n) In [colce 13 - E.c of colat is part 49. 3dt. * E. c of cost is : TARY 460 346 20161117 na 12 min 11 speed No. of unpained eo=4 40 KMnOu was expected to show no absorption bonele. but potassium permanganate have a strong absorption band because of the highere analyte concentration! The more light at a certain were length will" chescrubsoribed. CamScanner