Consider the following reactions :
`I Me- underset((A))(-=)-Me overset(Na+Liq. NH_(3))underset(EtOH)to (B)`
.
Which statement is wrong about the reactions (vii) and (viii) ?

Options

A. The product `(K)` is trans-but-2-ene and product `(L)` is cis-but-2-ene.
B. The product `(K)` is cis-bit-2-ene and product `(L)` is trans-but-2-ene.
C. Anti-elimination of `Br_2` takes place in both the reactions.
D. Both the reactions proceed by `E2` mechanism.

Answer

B

Explanation

Both debromination with NaI/acetone or dehydro-halogenation by base proceed by anti-elimination and `E2` machanism.
`{:(,"Reactant",,underset("elimination")("Mechanism of"),"product"),("a".,"Meso or erythro",,"trans (anti)","trans-Alkene"),("b".,(pm)"or threo",,"trans(anti)","cis-Alkene"),("c".,"Meso or erythro",,"cis (syn)","cis- Alkene"),("d".,(pm)"or threo",,"cis(syn)","trans-Alkene"):}`
.