Answer the following miscellaneous questions:

$(3$ pts$)$

${?}_{\text{l}\text{i}\text{n}\text{e}-\text{s}\text{e}\text{g}\text{m}\text{e}\text{n}\text{t}\text{f}\text{o}\text{r}la}^{\text{c}\text{o}\text{n}\text{v}\text{e}\text{r}\text{t}\text{t}\text{o}}$

or stick$-$like diagram

b$)$ Draw the most stable conformational structure for $2$methylpentane looking down at $C2-C3$

c$)$ Indicate the numbers of mono$-$chlorinated products for:

Write the appropriate resonance structure of the followings.

$(2$ pts$)$

$($a$)$