MCQ
In nucleophilic aliphatic substitution, the nucleophiles are generally
  • A
    Acids
  • Bases
  • C
    Salts
  • D
    Neutral molecules

Answer

Correct option: B.
Bases
b
(b  $R-X\,\,\,+\underset{\begin{smallmatrix} 
 \text{Nucleophile} \\ 
 \text{or base} 
\end{smallmatrix}}{\mathop{O{{H}^{-}}}}\,\to \,\,R-OH\,+\,{{X}^{-}}$

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Match $E ^{\circ}$ of the rebox pair in List $I$ with the values given in List $II$ and select the correct answer using the code given below the lists:

List $I$ List $II$
$P.$ $\quad E ^{\circ}\left( Fe ^{3+}, Fe \right)$ $1.$ $\quad-0.18 V$
$Q.$ $\quad E ^{\circ}\left(4 H _2 O \rightleftharpoons 4 H ^{+}+4 OH ^{-}\right)$ $2.$ $\quad-0.4 V$
$R.$ $\quad E ^{\circ}\left( Cu ^{2+}+ Cu \rightarrow 2 Cu ^{+}\right)$ $3.$ $\quad-0.04 V$
$S.$ $\quad E ^{\circ}\left( Cr ^{3+}, Cr ^{+2}\right)$ $4.$ $\quad-0.83 V$

Codes: $ \quad P \quad Q \quad R \quad S $