`{:("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"):}`

(a) Match the following {:("1. Big Bang theory","- (a) study of regions and practical use of plants"),("2. Petrifaction","- (b) organisms buried and cause depression"),("3. Archaeopterys","- (c) other name for astrobiology"),("4. Ethnobotany","- (d) preserve hard and soft parts"),("5. Mold","- (e) origin of universe"),("6. Exobiologi","- (f) fossil bird"):} (b) Match the following {:("1. Oparin and haldane"," (a) use and disuse theory"),("2. Ernest Haeckel","- (b) Mutation theory"),("3. Leonardo da vinci","- (c) Father of Indian paleobotany"),("4. Jean Baptiste Lamarck","- (d) Life from chemical reaction"),("5. Darwin","- (e) Father of paleontology"),("6. De vries","- (f) Radioactive carbon"),("7. Birbal sahani","- (g) Ethnobotany"),("8. W.F. Libby","- (h) Origin of species"),("9. J.W. Harshberger","- (i) Biogenetic law"):}

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"):}