Question

The reaction of 4-methyloct-1-ene (P, 2.52 g) with HBr in the presence of (C6H5CO)2O2 gives two isomeric bromides in a 9 : 1 ratio, with a combined yield of 50%. Of these, the entire amount of the primary alkyl bromide was reacted with an appropriate amount of diethylamine followed by treatment with aq. K2CO3 to give a non-ionic product S in 100% yield. The mass (in mg) of S obtained is ___. [Use molar mass (in g mol–1): H = 1, C = 12, N = 14, Br = 80]

Answer 1

Combined yield = 50%
50% of 2.52 = 1.26 g
M = 126
n4-methyloct-1-ene = 0.01
90% of 0.01 = 0.009
Mass of S = 0.009 × 199
= 1.791 g
= 1791 mg.