Which of the following reactions do not represent the major product of given Birch reductions?

Give the uses of hydrocarbons with examples.

Number of $\pi$ bonds in $CH_2=CH-CH=CH-C\equiv CH$ is

Answer the following questions:
$(i)$ Give hybridization of Carbon atoms in the following compound: $CH_3-CH=CH-CH_2-C\equiv CH$
$(ii)$ Give the number of $\sigma$ and $\pi$ bonds in the above compound.
$(iii)$ Give the $IUPAC$ name of the above compound.
$(iv)$ Draw the geometrical isomers of the above compound.
$(v)$ Why are $cis$ and $trans$ isomers not possible in alkynes?
$(vi)$ Which bond possesses more bond length between $C=C$ and $C\equiv C$?

Product $(A)$ is

$A \xrightarrow{\Delta, 800^\circ C} CH_2=C=O$. Reactant '$A$' in the reaction is: