Answer the following:
a) If the bond order (number of bonds) between two carbon atoms increases what will happen to bond length and bond energy?
b) What type of reactions usually occur in alkenes?
c) What type of isomerism is exhibited by `CHBr = CHBr`?
d) What type of `H_(2)C=C=CH_(2)` diene is?
e) Which type of mechanism is followed in Markownikoff's rule?
g) What reagent is used in the dehydrohalogenation of alkyl halides?
h) Name two reagents which can be used to test unsaturation?

Explanation

a) Bond length decreases and bond energy increases
b) Electrophilic addition reactions c) Geometrical or cis-trans isomerism d) Cumulated e) ionic mechanism f) free radical mechanism g) Alcoholic potassium hydroxide h) Bromine and Baeyer's reagent.