$(6)$ What product would you expect in the following reaction?

$=>\frac{1*Hg(OAC{)}_2,H_2\frac{O}{T}HF}{2*NaBH}$

$($a$)2-$ methylcyclopentanob

$($b$)$ hexane$-1,5-$diol

$($c$)1-$ methylicy clopentanoe

$($d$)$ methyl cyclopentane

$(7)$ which mecharism involves complete inversion of configuration at the site of substitution?

$($a$)$ Sni.

$($c$)E_1$

$($b$)S_{N}2$

$($d$)$ E$2$

Q$8)$ What is must likely starting compound?

$($a$)$

$($c$)$

$($b$)$

$($d$)$