In Lassaigne's test for the detection of halogens, the sodium fusion extract is first boiled with concentrated nitric acid. This is
to remove silver halides
to decompose Na2S and NaCN, if present
to dissolve Ag2S
to dissolve AgCN, if formed
0.25 g of an organic compound on Kjeldahl's analysis gave enough ammonia to just neutralize 10 cm3 of 0.5 M H2SO4. The percentage of nitrogen in the compound is
28
56
14
112
Lassaigne's test for the detection of nitrogen fails in
H2N-CO-NHNH2.HCl
NH2-NH2.HCl
NH2-CO-NH2
C6H5-NH-NH2.HCl
B.
NH2-NH2.HCl
Lassaigne's test is given by those nitrogenous compounds in which carbon is also present alongwith nitrogen. In NH2-NH2.HCl, carbon is absent, so it does not give Lassaigne's test.
When tetrahydrafuran is treated with excess HI, the product formed is
1, 4-diiodobutane
1,4-butanediol
2-iodotetrahydrofuran
4-iodo-1-butanol
Pick out the correct statements from the following and choose the correct answer from the codes given below
1. Hexa-1, 5-diene is a conjugated diene
2. Prop-1, 2-diene is conjugated diene
3. Hexa-1, 3-diene is a conjugated diene
4. Buta-1, 3-diene is an isolated diene
5. Prop-1, 2-diene is a cumulative diene
1, 2
3, 5
2, 3
4, 5
Which of the following process is suitable for the purification of aniline?
Simple distillation
Fractional distillation
Fractional crystallisation
Steam distillation
Of the isomeric hexanes, the isomers that give the minimum and maximum number of monochloro derivatives are respectively
3-methylpentane and 2,3-dimethylbutane
2,3-dimethylbutane and n-hexane
2,2-dimethylbutane and 2-methylpentane
2,3-dimethylbutane and 2-methylpentane
Acyclic stereoisomer having the molecular formula C4H7Cl are classified and tabulated. Find out the correct set of numbers
Geometrical | optical |
6 | 2 |
Geometrical | optical |
4 | 2 |
Geometrical | optical |
6 | 0 |
Geometrical | optical |
6 | 0 |
Compare List-I and List-II and choose the correct matching codes from the choices given.
List - I | List - II |
A. Glycerol | i. Sublimation |
B. o-nitrophenol | ii. Beilstein's test |
C. Anthracene | iii. Victor- Meyer's method |
D. Halogens | iv. Steam distillation |
E. Molecular weight |
v. Vaccum distillation vi. Eudiometry |
A - v; B - iv; C - i; D - ii; E - iii
A - iv; B - v; C - i; D - vi; E - ii
A - vi; B - iv; C - i; D - iii; E - ii
A - v; B - iv; C - vi; D - ii; E - iii