Which of the following structures represents $1,3\text{-butadiene}$?

Identify the major product $B$ in the given sequence of reactions:
$CH_3-C \equiv CH$ $\xrightarrow{H_2 / Pd-C} A$ $\xrightarrow{(C_6H_5CO)_2O_2 / HBr} B$

An alkene $X$ with formula $C_4H_8$ does not exhibit geometrical isomerism. In the conversion of $X$ to $Y$,the correct sequence of reagents $A$ and $B$ used are ($Y$ gives iodoform test):
$X$ $\xrightarrow{A} \text{Intermediate}$ $\xrightarrow{B} Y$

The number of hydrogen atoms which can participate in hyperconjugation in $Y$ is

An alkene $'A'$ contains three $C-C$,eight $C-H$ $\sigma$ bonds and one $C-C$ $\pi$ bond. $'A'$ on ozonolysis gives two moles of an aldehyde of molar mass $44 \ u$. Write the $IUPAC$ name of $'A'$.

Which of the following reactions follows Markownikoff's rule for addition?