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Conversion of `(A)` to `(B)` is stepping up by one `C` atom. `(B)` is `1^@ ROH` which can be obtained by the reaction of `G.R` of `(A)` with `HCHO` (formaldehyde). Further, `(B)` to `( C)` and `(D)` is an acid-catalysed dehydration of alcohol to give alkene.

Since deuterium shows a kinetic isotope effect, i.e., it undergoes reaction more slowly than protium, the predominant product is `( C)`.
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