Which of the following is an incorrect statement?
a) Rate of formation of (II) and (IV)would be identical
b) Rate of formation of (I) would be slower than that of (III)
c) Formation of (I) would show primary isotope effect
d) Formation of (III) involves E1 reaction

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Solution

Answer: d
Explanation: Rate of formation of II and IV similar because $H$ & $D$ are approximate of the same size.
$C - H$ & $C - D$ bond breaking is the part of $R D S$ hence rate in (I) is slower than (III)
It undergoes $E_{2}$ not via $E_{1}$ because carbocation is not stable.

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