Welcome to your PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS -1
1.
In Carius tube, ClCH₂COOH heated with fuming HNO₃ + AgNO₃ gives a white precipitate. It is:
2.
Best method to separate sugar:
3.
Compound NOT giving blue Lassaigne test:
4.
Impure glycerine purified by:
5.
Heating human hair → ammonia smell indicates:
6.
Nitrogen in organics estimated by:
7.
Lassaigne test blue colour due to formation of:
8.
Carbon & hydrogen are estimated by:
9.
Aniline is purified by:
10.
In Kjeldahl method, nitrogen estimated as:
11.
Molecular mass of volatile substance by:
12.
Highest molecular weight:
13.
Compound NOT giving Lassaigne nitrogen test:
14.
Hydrocarbon H:C = 3:1 empirical formula:
15.
Benzene + chloroform mixture separated by:
16.
Method to separate immiscible liquids:
17.
Empirical formula CH₂O; probable MF?
18.
Substance igniting during sodium fusion:
19.
Equivalent mass of acid =
20.
Fractional distillation effective if BP difference:
21.
Thiophene removed from benzene by:
22.
Beilstein test detects:
23.
Best method to detect water:
24.
High vapour pressure below MP:
25.
First vapours when heating petroleum:
26.
Absolute alcohol prepared by:
27.
Paper chromatography mobile phase:
28.
Azeotropes separated by:
29.
Benzoic acid + naphthalene separated by?
30.
Purification of aniline:
31.
Compound NOT giving AgCl (AgNO₃ test):
32.
In Kjeldahl method, K₂SO₄ acts as:
33.
No direct test for detection of:
34.
Decomposable liquids distilled by:
35.
Fractional crystallization depends on difference in:
36.
Compound in positive Lassaigne nitrogen test:
37.
Absolute alcohol cannot be obtained by simple distillation because:
38.
Vapour pressure in steam distillation is:
39.
Purity of organic compounds via:
40.
In Kjeldahl, CuSO₄ acts as:
41.
Dibasic acid % composition C=26.7, H=2.2, O=71.1 → EF?
42.
MF = 3 × EF (EF=CH₂). Vapour density?
43.
Chromatography used for:
44.
Diacidic base: MW=82; chloroplatinate = 0.984g. Pt content =
45.
Function of boiling sodium extract with HNO₃ before halogen test:
