In order to exhibit delocalized π bonding, a molecule must have

a. at least two π bonds

b. at least two resonance structures

c. at least three σ bonds

d. at least four atoms

e. trigonal planar electron domain geometry

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world