Two isomers 'A' and 'B' with molecular formula C₄H₈ give different products on oxidation with KMnO₄ is acidic medium. Isomer 'A' on reaction with KMnO₄/H⁺ results in effervescence of a gas and given ketone. The compound 'A' is

 

 

The cis-alkenes are formed by the reduction of alkynes with

<!-- [if gte mso 9]><xml> </xml><![endif]--> + CH₄  --> A + B

A and B in the above atmosphere reaction step are:

In bromination of Propyne, with Bromine 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2- tetrabromopropane obtained from 1g of Bromine in this reaction is_______________× 10^-1g. (Nearest integer) (Molar mass: Bromine = 80g / mol)