Which of the following is the most stable alkene?

Rank the following alkenes in order of increasing $\lambda_{max}$:
$(1)$ $A$ conjugated diene in a bicyclic system.
$(2)$ An isolated diene in a bicyclic system.
$(3)$ $A$ conjugated diene in a bicyclic system (different substitution pattern).

Propane is obtained from propene by which method?

The major product of the following addition reaction is: $CH_3-CH=CH_2 \xrightarrow{Cl_2/H_2O}$

The reaction of propene with $HOCl$ proceeds via the addition of

The addition of $HBr$ is easiest with