Question

Which of the following are $1^o$ amines ?

• A. $\left(A\right),\left(B\right),\left(C\right),\left(D\right)$
• B. $\left(E\right),\left(F\right),\left(G\right)$
• C. All
• D. None

Answer 1

Answer: (A)

$\left(A\right),\left(B\right),\left(C\right),\left(D\right)$

Let the formula of amines be $RN{H}_2$ and that of the hydrochloride be $R\stackrel{\oplus }{N}{H}_3\stackrel{\oplus }{C}I$

Let the weight of $R\stackrel{\oplus }{N}{H}_3\stackrel{\oplus }{C}I$ be $x$ gm

$\therefore x$ gm of $R\stackrel{\oplus }{N}{H}_3\stackrel{\oplus }{C}I$ contains $\Rightarrow 35$ gm of $Cl$

$100$ gm of $R\stackrel{\oplus }{N}{H}_3\stackrel{\oplus }{C}I\Rightarrow \frac{35.5}{x}\times 100=32.42$

$\therefore x=109.5$ $\therefore R\stackrel{\oplus }{N}{H}_3\stackrel{\oplus }{C}I=109.5$

Let the weight of $R=y$

$\therefore y+17+35.5=109.5$

$y=57;R$ can be $C_4{H}_9$

Formula is $C_4{H}_9\stackrel{\oplus }{N}{H}_{3}C{l}^{-\ominus }$.