Welcome to your P & C of OC - 4
1.
Which element cannot be detected directly in organic compounds?
2.
Which halogen is not detected by Lassaigne’s test?
3.
Which compound gives positive test for both N and S?
4.
Halogen test is done after boiling sodium extract with
5.
Order of solubility of AgX in NH3 is
6.
Nitrogen detection gives Prussian blue colour due to formation of
7.
Which reagent is used for carbon and hydrogen detection?
8.
Hinsberg reagent is used to separate
9.
Benzene is separated from thiophene using
10.
Detection of elements is called
11.
Halogens are detected using
12.
Thiophene dissolves in conc. H2SO4 due to
13.
Sodium extract must be
14.
Lassaigne’s extract is
15.
Which precipitate dissolves in NH3?
16.
Carbon detection is based on formation of
18.
Which compound does NOT give positive Lassaigne test for nitrogen?
19.
Which compound gives false negative nitrogen test?
20.
When both nitrogen and sulphur are present, which compound is formed?
21.
Limewater turns milky due to formation of
22.
Deep blue colour in nitrogen test confirms formation of
23.
Sulphur is detected by sodium nitroprusside test due to formation of
24.
Chromatography is useful when substance is present in
25.
Lead acetate test for sulphur gives
26.
Potassium is not used in Lassaigne’s test because it
27.
Gas-liquid chromatography mobile phase is
28.
Why halogen test is done after acidifying extract?
29.
Nitrogen in organic compound is converted into which compound during sodium fusion?
30.
Chromatography separates substances based on
31.
Phenol is separated from acids using
32.
Carbon detection test fails if
33.
Which compound interferes in nitrogen detection giving false result?
34.
Hydrogen detection is confirmed by
35.
Prussian blue colour disappears if
36.
Purpose of fusing organic compound with sodium in Lassaigne’s test is to convert elements into
37.
CO2 evolution confirms presence of
38.
Which halogen gives yellow precipitate with AgNO3?
39.
Halogens are detected in Lassaigne’s test in the form of
40.
Sulphur is converted into which ionic species in Lassaigne’s test?
41.
Fresh FeSO4 is compulsory in nitrogen test because old FeSO4
42.
Hoffmann’s method separates amines using
43.
Why lithium is not used in Lassaigne’s test?
44.
Absolute alcohol is separated using
45.
Which reaction forms NaCN in fusion?
