Which of the following compounds is the most stable?

The most strained cycloalkane is

The general formula of a cycloalkane is

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

Identify the product $Z$ in the following series of reactions: $CH_3CH_2OH$ $\xrightarrow{SOCl_2, \Delta} X$ $\xrightarrow{Mg, \text{Dry ether}} Y$ $\xrightarrow{NH_3} Z + Mg(Cl)(NH_2)$

What is the number of moles of ethane obtained from $2n$ moles of bromomethane using $2n$ moles of sodium atoms in dry ether medium?