What is the structure of the $2$-butenyl radical?

What is the major product of the reaction $CH_2 = CH-(CH_2)_8COOH + HBr \xrightarrow{\text{Peroxide}} \dots$?

The reaction of $1-$ethylcyclopentene with $BH_3 / THF$ followed by treatment with $H_2O_2 / NaOH$ produces:

If $(P)$ and $(Q)$ are major products,then find the incorrect statement for the given sequence: $(\pm)-CH_3-CH_2-CH(OH)-CH_3$ $\xrightarrow[\Delta]{H_3PO_4} P$ $\xrightarrow{D_2, Ni} Q$

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

An alkene $X$ $(C_6H_{12})$ on ozonolysis gives acetaldehyde and ethyl methyl ketone. What is the product formed when $X$ reacts with $HBr$?