The reaction of 4 -methyloct- 1 -ene ( P, 2 . 52g ) with HBr in the...

The 1-alkene undergo addition reaction and major product formed according to anti-Markonikov's rule.

Moles of $P$ $= \dfrac{MassofP}{MolarmassofP} = \dfrac{2 . 52}{252} = 0 . 01mol$

Given that isomeric bromides formed have the mole fractions $\dfrac{9}{10}$ and $\dfrac{1}{10}$

Moles of $A$(major product) $= 0 . 02 \times \dfrac{9}{10} \times \dfrac{50}{100} = 0 . 009mol$

Now the alkyl bromide formed undergo nucleophilic substitution reaction with diethyl amine and potassium carbonate.

In the above reaction, the product $S$ formed has the molecular weight $= 199g{mol}^{- 1}$

Mass of $S = 0 . 009 \times 199$

$= 1 . 791g$

$= 1791mg$