JEE Main levelOne or more correct optionsDifficulty 2 of 3o4028
Which of the following statements about the E2 reaction of a secondary alkyl halide with a strong base is/are correct?
AThe reaction is second order overall, first order in each of the halide and the base.
BRearranged alkenes are the usual products because a carbocation is formed.
CThe beta-hydrogen and the leaving group are normally anti-periplanar in the transition state.
DReplacing the beta-hydrogens by deuterium slows the reaction (kH/kD>1).
Answer: A, C, D
E2 is a single concerted step with rate = k[RX][base], normally through an anti-periplanar H and X, and with a primary isotope effect kH/kD>1. It involves no carbocation, so rearranged skeletons are not expected.