$2$

C$)I>IV>II>$III

D$)$ DIV$>$III$>II$

$8-$ Which compound $Rx$ reacts MOST rapidly in an $S_{N}1$ reaction?

A$)2-$Bromohexane

B$)3-$Bromohexane

C$)2-$Bromo$-2-$methylhexane

D$)1-$Bromo$-3-$methylhexane

$9-$ What reactants are required to achieve the following transformation?

A$)\frac{1-B{r}_2,\text{l}\text{i}\text{g}\text{h}\text{t}}{2*C{H}_3\text{O}\text{N}\text{a}}$

B$)\frac{1.HOC{H}_4}{2-H_{2}S{O}_4}$

C$)C{H}_{3}OH$

D$)NaOC{H}_3$

$10-$ What is the correct stereochemistry of the product of the following reaction: $$exressNaces

A$)3R,4S$

B$)2S,3R$

C$)4R,4R$

D$)2R,3R$

E$)2R,3S$

$11-$ Which two reaction types have the same initial step?

A$)S_{N}2$ and $S_{N}1$ reaction

C$)S_{N}1$ and $E_2$ reaction

E$)$ none of the above

B$)S_{N2}2$ and $E_2$ reaction

D$)S_{N}1$ and $E_1$ reaction

$12-$ Which statement about the preparation of Grignard reagents is not true

A$)$ The reaction is normally done in an ether solvent.

B$)$ Methyl, primary, secondary$,$ tertiary alkyl and aryl halides may be used.

C$)$ It ean be prepared in presence of other functional group such as hydroxyl group

D$)$ The halogen may be chloride, bromide, or iodide.

$13-$Tert$-$Butoxide dissolved in tert$-$butyl alcohol and reacted with primary alkylhalide, the majority of the reaction undergoes:

A$)S_{N}2$ reaction

B$)E2$ reaction

C$)S_{w}1$ reaction

D$)$ El reaction

E$)$ none of the above

$14.$ If the reaction rate of the following reaction is $x,$ doubling the concentration of NaOH would give what rate?

A$)2$

B$)\frac{x}{2}$

c$)2x^2$

D$)\frac{x^2}{2}$

B$)$ no change in reaction mato

$15.$ Reaction of the following Grigmard nasent with methunal gives: