$\frac{{\mathrm{Cl}}_2/\mathrm{h\upsilon }}{\text{ (monochlorination) }}\to$Which statement is correct about photochemical chlorination of the above compound:

The order of the reactivity of phenyl magnesium bromide with the following compounds is:

$1$-Bromo-$3$-chlorocyclobutane will react with two moles of $\mathrm{Na}$ in ether producing:

${\left({\mathrm{CH}}_3\right)}_2\mathrm{CH}-{\mathrm{CH}}_2{\mathrm{CH}}_3\stackrel{{\mathrm{Cl}}_2/\mathrm{h\nu }}{⟶}\left[\mathrm{N}\right]\frac{\text{ Fractional }}{\text{ distillation }}\left[\mathrm{P}\right]$ The number of possible isomers $\left[\mathrm{N}\right]$ and number of fractions $\left[\mathrm{P}\right]$ are: