Question

An organic compound A containing C = 70% and H =11.6% gave the following results :
(P) 0.384 gm of the compound A displaced 100 ml of air at 1 atm and 273 K.
(Q) On treatment with `PCl_(3)`A gave another compound, which contained 33.97%(34%)chlorine.
IUPAC anme of the compound A is :
A. pentanal
B. 2- pentanone
C. cyclopentanol
D. 1,3-epoxypentane

Answer 1

Correct Answer - c
For empirical formula
`{:("Element",%,"At.Wt.","Ralative ratio","Simple ratio"),(C,70,12,5.83,5.06(5)),(H,11.6,1,11.6,10.086(10)),(O,18.4,16,1.15,1(0)):}`
So, organic compound`(C_(5)H_(10)O)_(x)`
Molecular waight`=(WRT)/(PxxV)=(0.384xx0.0821xx273)/(1xx(100)/(1000))`
`" "=86`
`" "86xx = 86`
`rArr" "`x = 1
So, compounA is `C_(5)H_(10)O`.
If compound A is alodohol.
`C_(5)H_(10)Ooverset(PCl_(5))rarrC_(5)H_(9)Cl`
`(12xx5+9+35.5=104.5)" "(%Cl=(35.5)/(104.5)=33.97)`