An organic compound 'A' has molecular formula C₈H₁₈ which on monobromination produced three isomeric products B, C and D, among which B and C are enantiomer whereas D is achiral. Treament of either C or D with alcoholic KOH produced some product E while B on similar treatment produced F (C₈H₁₆ ) an isomer of E as major product. Establish structure A to F.