Question

Which compounds will form meso product with Br2/CCl4?
(a) 1–butene (b) 1–butene (c) trans–2–butene (d) cis–2–pentene

Which among the following compounds has minimum pH value :
(a) Butane (b) 2–butene (c) 1–butyne (d) 2–butyne

Which alkene will give optically inactive product with Br2/CCl4?
(a) 1–butene (b) Propene (c) cis–2–butene (d) trans–2–butene

Which alkene will give optically active diol with Baeyer’s reagent ?
(a) 1–butene (b) Propene (c) cis–2–butene (d) trans–2–butene

Answer 1

Answer:

all in one answer :-

The product is meso because the intermediate involves anti addition to a cyclic chloronium ion.