sp, sp2, sp3
What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.
Apart from tetrahedral geometry, another possible geometry for CH4 is square planar with the four H atoms at the corners of the square and the C atom at its centre. Explain why CH4 is not square planar?
Distinguish between a sigma and a pi bond.
What is the total number of sigma and pi bonds in the following molecules?
(a) C2H2 (b) C2H4
Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in C2H4 and C2H2 molecules.