Colour of compounds occurs due to phenomenon of polarisation, charge transfer, d-d transition and H.O.M.O.-L.U.M.O. transition. Most of the transition metal complex compound are coloured either due to

Question

Colour of compounds occurs due to phenomenon of polarisation, charge transfer, 
d-d transition and H.O.M.O.-L.U.M.O. transition. Most of the transition metal 
complex compound are coloured either due to d-d electron transition or charge 
transfer and ionic compounds are coloured due to polarisation of anion.

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: Determine the number of π-bonds in each thionic/sulfur oxyacid species by drawing their Lewis structures to satisfy octets/valencies (S exhibits variable valency up to 6). Step 2: Calculate the π-bonds: (II) H2S2O3 has 2 π-bonds; (III) H2S2O5 has 3 π-bonds; (I) H2S2O6 has 4 π-bonds. Step 3: Order the compounds by increasing number of π-bonds: II (2) < III (3) < I (4), which corresponds to option (c).

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