a) Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour.
b) Write the structural formulae and IUPAC names for all the structural isomers of alkenes with molecular formula `C_(5)H_(10)`.
c) Write the various types of isomerism shown by alkenes. Give one example of each.

Explanation

a) The decreasing order of acidic strength is:

the acidic character is linked with the percentage or s-character. Greater than s-character, more is the electronegativity of the carbon atom nad more will be the acidic character.
b)