Which of the following alkenes is the most stable?

Name the alkenes which will yield $1-$chloro$-1-$methylcyclohexane by their reaction with $HCl$. Write the reactions involved.

Complete the following reactions:
$(i)$ $C_2H_4 + O_2 \rightarrow$
$(ii)$ $4Al + 3O_2 \rightarrow$

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).

At $530 \ K$,glycerol reacts with oxalic acid to produce:

What is the product formed when $1$-butene is heated with $Al_2(SO_4)_3$ at $500 \ K$?