Chapter 25

Question 1

aliphatic :
aromatic or arene: .

Answer 1

aliphatic : straight or branched chain organic substances
aromatic or arene: includes one or more ring of six carbon
atoms with delocalised bonding.

Question 2

Benzene’s Structure

Answer 2

C6H6
six C atoms in a hexagonal ring, with H atom bonded to each
single covalent σ-bonds.
one unused electron on each C atom in a p orbital, perpendicular to the plane of the ring.
delocalised in a ring structure above and below the plane of carbon atoms

Question 3

kekule proposition

Answer 3

Kekule suggested the following
structure for Benzene consisting of
alternate single and double covalent
bonds between the carbon atoms