The maximum number of isomeric monochloro derivatives which can be obtained from $2,2,5,5-$tetramethylhexane by chlorination is $..............$.

$n$-Butane on monochlorination under photochemical conditions gives an optically active compound "$P$". "$P$" on further chlorination gives dichloro compounds. The number of dichloro compounds obtained (ignore stereoisomers) is:

What is $Z$ in the following reaction?
$CH_3-CH_2-CO_2^{\ominus} Na^{\oplus} \stackrel{NaOH / CaO}{\longrightarrow} Z$

$X$ is an isomer of $C_6H_{14}$. It has four primary carbons and two tertiary carbons. '$X$' can be prepared from which of the following reactions?

An alkane $(Y)$ requires $8$ moles of oxygen for complete combustion and on chlorination with $Cl_2/h\nu$, $(Y)$ gives only one monochlorinated product $(Z)$. The total number of primary carbon atoms in $(Y)$ is . . . . . . .

Which of the following alkanes is used for road surfacing?