Which of the following statements is correct about the metal-bound arene ring in (η6-C6H6)Cr(CO)3?
a- The metal-bound ring is more susceptible to attack by electrophiles than free C6H6
b- The metal-bound ring is more susceptible to attack by nucleophiles than free C6H6
c- The metal-bound ring readily undergoes addition reactions, whereas free C6H6 does not
d- The metal-bound ring is less susceptible to attack by nucleophiles than free C6H6