MCQ
Identify correct reactivity for $E_2$ reaction with alc. $KOH$


- ✓$i > ii > iii$
- B$ii > iii > i$
- C$i > iii > ii$
- D$iii > i > ii$

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Which of these structures is practically not a valid canonical structure for formaldehyde ?
$A.$ $Sm ^{2+}$ $B.$ $Ce ^{2+}$ $C.$ $Ce ^{4+}$ $D.$ $Tb ^{4+}$
Choose the most appropriate answer from the options given below :