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{:("1. Electrovalent bonding","a. Benzen...

`{:("1. Electrovalent bonding","a. Benzene"),("2. Covalent bonding","b. Heitler and London"),("3. Valence Bond theory","c. Electron transfer"),("4. Polarised Bond","d. Electron sharing"),("5. Resonance","e. Fajan.s theory"),(,"f. Aluminium chloride"):}`

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Match {:(A,"Molecules with electron deficient central atoms",1,PCl_(5)),(B,"Molecules containing odd electrons",2,BF_(3)),(C,"Molecules containing expanded valence shells ",3,NO_(2)):}

{:(,"Borax bead test",,),(1.,"Copper","a.","Blue"),(2.,"Iron","b.","Grey"),(3.,"Manganese","c.","Red"),(4.,"Cobalt","d.","Bottlegreen"),(5.,"Chromium","e.","Colorless"),(,,"f.","Green"):}