$(27)$ In the friedel$-$crafts raction, with benzene with $AlC{l}_3,$ why is propanoyl choloride preferred to $1-$choluropropane in eventually generating propylbenzene?

$($a$)$ the chlorine atom is easier to move

$($b$)$ it avoids the problem of hydride shift

$(28)($c$)1-$ choloro propane is a gas

$($d$)$ propanoyl chloride is less expensive

$(28)$ The realative reactivity of alkane hydrogens to radical chlorination can vary' consider the monochlorination of $2-$ methylbutane and the four products produced? from this data what is the appxox. relative reactivity blw

$($a$)1$ to $2($primary fo tertiary$)$

$($b$)1+05([n,4])$

$($c$)3$ to $2($n u v$)$

$($d$)1$ to $4($n n $4$

$(29)$ In the following sequence what is R$?$

$($a$)$ cycunexene

$($c$)$ hex$-3-$ene

$($b$)$ aniline

$($d$)$ cyclopentanol.