What is the major product formed when $1, 3$-butadiene reacts with $1 \ mol$ of $HCl$ at high temperature ($100^{\circ}C$ or above)?

Product $(P)$ is

How many products are formed in the following reaction?
$1,4$-dimethylcyclohex-$1$-ene + $HBr \rightarrow$ ?

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.

For the given reaction sequence,identify the products $(C)$ and $(D)$ formed after ozonolysis of the major product $(B)$:
$(CH_3)_2CH-CHCl-CH_3$ $\xrightarrow{C_2H_5ONa / C_2H_5OH} B$ $\xrightarrow{O_3 / H_2O_2} C + D$

Propene,when heated with chlorine at approximately $500^\circ C$,forms: