MCQ
$NaOH/{H^ + }$ reacts with
- A${C_6}{H_5}OC{H_3}$
- B$C{H_3}OH$
- ✓$C{H_3} - \mathop C\limits^{\mathop {||}\limits^O } - C{H_3}$
- D${C_2}{H_5}OH$
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$A \,|\, A^+\, (xM)\, ||\, B^+ \,(yM)\, |\, B$
The $emf$ measured is $+ 0.20\, V.$ The cell reaction is

$C{H_3}MgI + HCHO \to $Product