Consider the two diols (1 and 2) and the two ketones (3 and 4).
A mixture of 3 and 4 is formed by pinacol rearrangement of either 1 or 2. Given that an ethyl migrates in preference to methyl in pinacol rearrangements, predict the major ketone formed by rearrangement of each diol.
Diol 2 gives predominantly
A. Ketone 3
B. Ketone 4
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