Consider the following reaction. Which of the following bases will give the best yield of the alkene $(II)$ as the major product?

Predict the major product for the following reaction: $CH_3-CH(CH_3)-ONa + (CH_3)_3C-Cl \xrightarrow{\Delta} \text{Major product}$

Identify $A, B, C, D, E, R$ and $R^1$ in the following reactions:
$Cyclohexyl-Br + Mg$ $\xrightarrow{dry\,ether} A$ $\xrightarrow{H_2O} B$
$R-Br + Mg$ $\xrightarrow{dry\,ether} C$ $\xrightarrow{D_2O} CH_3-CH(D)-CH_3$
$CH_3-C(CH_3)_2-C(CH_3)_2-CH_3 \xleftarrow{Na/ether} R^1-X$ $\xrightarrow{Mg} D$ $\xrightarrow{H_2O} E$

Among the following,which will readily undergo $S_{N}2$ reaction?

Identify the reagent $A$ in the following conversion.
Alkyl halide $\xrightarrow{A}$ Alkyl nitrite

Arrange the following compounds in order of increasing $S_N1$ reaction rate:
$(i)$ $Ph-C(CH_3)_2-Br$
(ii) $CH_3-CH_2-CH(CH_3)-Br$
(iii) $(CH_3)_3C-Br$
(iv) $CH_3-CH_2-CH(CH_3)-Cl$