Why is benzene extraordinarily stable though it contains three double bonds

In silicon dioxide : each siliçon atom is surrunded by four oxygen atoms and each oxygen atoms is bonded to two silicon atoms, silicon atom is bonded to two oxygen atoms , there are double bond between silica and oxygen atoms, silicon atom is bonded to five oxygen atoms

Why does benzene undergo melting point increases

Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitution with difficulty?

Assertion : Aryl halides undergo nucleophilic substitution with ease Reason : Carbon-halogen bond in aryl halides has partial double bond character.

Three fused benzene rings are found in.

The following are equations for dissociations of a compound. NH_(3(aq)) + H_2O_(I) harr NH_(4(aq))^+ + OH_(aq)^(-) Why ammonia is termed as a base though it does not contain OH^- ion?