Short Answer TypeYou are given samples of ethane, ethene and ethyne in three different containers. How will you distinguish them?
Long Answer TypeExplain isomerism in arenes.
Arenes show position isomerism in their molecules. The isomers differ with respect to the relative positions of the alkyl substituents. In disubstituted derivates (-CH3 group on the substituent), three isomers are possible.
Similarly, three position isomers of trimethyl benzene are:
In the case of bicyclic arenes such as naphthalene, even monosubstituted compounds show position isomerism. For example. 
Short Answer TypeBenzene ring has three double bonds in it but is still quite stable. Explain.
Or
Why is benzene extra-ordinary stable though it contains three double bonds?
Long Answer TypeShort Answer Type
Switch
-electrons).
-electrons?
