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: D. Step 1: Determine the geometry of ethyne (C2H2): each carbon is sp hybridized, yielding a symmetric linear structure (H-C≡C-H). Step 2: Analyze the structures of the options: H2O2 is open-book (non-planar), NO2 is bent (sp2 with an odd electron), SnCl2 is bent (sp2 with one lone pair). Step 3: Carbon dioxide (CO2) is sp hybridized and linear (O=C=O). Therefore, C2H2 is isostructural with CO2, matching option (d).

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