On mixing an alkane with chlorine and irradiating with ultra-violet light,it forms only one mono-chloro-alkane. The alkane is

What is the correct order of ease of replacement of the hydrogen atom by a chlorine atom in the following compound by photochlorination?

At $25,^oC$,Ethylene glycol is a:

Identify the major product $Y$ in the following reaction sequence:
$CH_3-CH(CH_3)-CH_2-Cl$ $\xrightarrow[\text{dry ether}]{Na} X$ $\xrightarrow[\text{monobromination}]{Br_2/h\nu} Y$ (major)

How many dichloro products are formed in the reaction of cyclopentane with excess $Cl_2$ in the presence of $h\nu$ (including stereoisomers)?

$A$ hydrocarbon of molecular mass $72 \ g \ mol^{-1}$ gives a single monochloro derivative and two dichloro derivatives on photochlorination. Give the structure of the hydrocarbon.