Benzene vs phenol vs alkenes

Question 1

What is Pi bonding?

Answer 1

It is electron rich

Question 2

What is the pattern of reactivity between cyclohexene and benzene?

Answer 2

Cyclohexene is more reactive

Question 3

Why is cyclohexene more reactive than benzene?

Answer 3

Higher electron density as the pi bond is localised between carbons, and this can induce a dipole in the Br2

Question 4

Why is bezene less reactive than cyclohexene?

Answer 4

It has a lower electron density as the pi electrons and delocalised across the whole ring, so there is sufficient electron density to induce a dipole in the Br2, meaning a halogen carrier catalyst is required to produce the Br+ electrophile

Question 5

What is the pattern of reactivity between benzene and phenol?

Answer 5

Phenol is more reactive

Question 6

Why is phenol more reactive than benzene?

Answer 6

It has a higher electron density as one of the lone pairs from the O in the phenol joins the delocalised pi cloud, increasing it electron density and making it able to induce a dipole in the attacking species without a catalyst