Question

Consider the reactions,

(i) \[\begin{array}{cc}
\phantom{}\ce{\underset{}{(CH3)2CH - CH2Br} ->[C2H5OH] \underset{}{(CH3)2CH - CH2OC2H5 + HBr}}\\
\end{array}\]

(ii) \[\begin{array}{cc}
\phantom{}\ce{\underset{}{(CH3)2CH - CH2Br} ->[C2H5O-] \underset{}{(CH3)2CH - CH2OC2H5 + Br-}}\\
\end{array}\]

The mechanisms of reactions (i) and (ii) are respectively:

Options

• S_Nl and S_N2

• S_Nl and S_N1

• S_N2 and S_N2

• S_N2 and S_N1

Answer 1

S_N2 and S_N2

Explanation:

These reactions are purely S_N2 reactions as in reaction (i) and (i) no rearrangement takes place (rearrangement occurs in S_N1 mechanism). Simple substitution of nucleophile takes place.