Question

How will you demonstrate that double bonds of benzene are somewhat different from that of olefines?

Answer 1

"The "double bonds" of "olefins" decolorize "bromine water" and discharges pink color of Bayer's reagent. These reactions are not carried out by benzene

The main reason for this is the bromine water gets added across the olefin double bonds but not across the benzene double bonds because in benzene, the double bonds are not considered as 100% double bonds, the carbon-carbon length are same despite of being double bonds in them.  

Benzene varies significantly from olefins in chemical properties and in structure with the "delocalization of electrons". This gives special aromatic character to benzene molecules."

Answer 2

Answer:

• How will you demonstrate that double bonds of benzene are somewhat. ... This is beacuse bromine gets added across olefinic double bond but not across the benzene double bond. It happens beacuse benzene double bonds are not 100% double bonds.