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

How many of the following compounds on reductive ozonolysis produce formaldehyde $(HCHO)$ as one of the products? The compounds are: $1$-butene,$2$-butene,$2$-methyl-$1$-butene,cyclopentene,cyclobutene,$1$-methylcyclopropene,methylenecyclopropane,$1$-methylcyclopropene (isomer),and cyclohexene.

Which alkene is most stable?

Which of the following is the most stable alkene?

The alkene $R-CH=CH_2$ reacts readily with $B_2H_6$ and forms the product $B$,which on oxidation with alkaline hydrogen peroxide produces:

What is the major product of the following reaction?
$CH_2=CH-CH=CH_2 + Br_2 \text{ (1 eq)} \xrightarrow{\Delta} ?$