MCQ
A solution of optically active $1$ -phenylethanol racemizes in acidified aqueous medium. It is due to
- Aenolization
- ✓carbonium ion formation
- Ccarbanion formation
- Dreversible oxidation-reduction

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$\text { A } \quad\quad\quad\quad\quad \text { B } \quad\quad\quad\text { C } \quad\quad\quad\quad\text { D }$
$1 \times 10^{-4} \quad 2 \times 10^{-4} \quad 0.1 \times 10^{-4} \quad 0.2 \times 10^{-4}$
(Where $E$ is the electromotive force)
Which of the above half cells would be preferred to be used as reference electrode?


$(C= 3 \times 10^8 \,ms^{-1}$ and $N_A =6.02 \times mol^{-1}).$