Question

`[A],[B],[C],[D],[E],[F]`,and `[G]` are amines,each of which forms a hydrochloride containing `32.42%`chloride.`[A],[B],[C]`and,`[D]`evole`N_(2)`on reaction with `HNO_(2)`but `[E],[F]`,and`[G]`donot.
Which of the following does not represent the structure of (A),(B),(C), and (D)?
A.
B.
C.
D.

Answer 1

Let the formula of amines be ` RNH_2` and that of the hydrochloride be ` R overset (o+) (N) H_3 overset (Θ)(C ) l`.
Let the eight of ` R overset (o+) (N) H_3 overset (Θ)(C ) l`.be x gm.
`:. x` gm of `R overset (o+) (N) H_3 overset (Θ)(C ) l` contatins ` rArr 35 gm` of `Cl`
`100 gm ` of `R overset (o+) (N) H_3 overset (Θ)(C ) l rArr ( 35 .5)/(x) xx 100 = 32. 42` ltbgt ` :. x = 109 . 5 :. R overset (o+) (N) H_3 overset (Θ)(C ) l = 109 . 5`
Let the weight of ` R=y`
` :. y= + 17 + 35.5 = 109 . 5`
` y = 57: R` can be `C_4 H_9`.
Formula is ` C_4 H_9 overset (o=) H_3 Cl^ (Θ)`.

`(A) , (B ) . (C )` and (D) ` 1^@` aliphatic amines and they give alcohol and ` n_2`, on treatiment wirh ` NaNO_2` acid , and also from hyerochlride .
.
(E), (F) and (G ) are ` 2^@` aliphatic amines and they do not give ` N_2` gas but form hydrochloride salt .