When thiourea is heated with metallic sodium, the compound which can't be formed is
Important Questions on Organic Chemistry - Some Basic Principles and Techniques
| Column – | Column - | ||
| A. | Aniline | i. | Red colour with |
| B. | Benzene sulfonic acid | ii. | Violet color with sodium nitroprusside |
| C. | Thiourea | iii. | Blue color with and acidic solution of |
Match List-I with List-II
| List-I | List-II | ||
| Test/Reagents/Observation(s) | Species detected | ||
| (a) | Lassaigne's Test | (i) | Carbon |
| (b) | Cu(II) oxide | (ii) | Sulphur |
| (c) | Silver nitrate | (iii) | , and halogen |
| (d) | The sodium fusion extract gives black precipitate with acetic acid and lead acetate | (iv) | Halogen Specifically |
The correct match is :
Given below are two statements :
Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.
Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give and .
In the light of the above statements, choose the most appropriate answer from the options given below
The formula of the purple colour formed in Lassaigne's test for sulphur using sodium nitroprusside is
Number of isomeric compounds with molecular formula which
(i) do not dissolve in
(ii) do not dissolve in .
(iii) do not give orange precipitate with - DNP
(iv) on hydrogenation give identical compound with molecular formula is
Given below are two statements:
Statement I: Sulphanilic acid gives esterification test for carboxyl group.
Statement II: Sulphanilic acid gives red colour in Lassigne’s test for extra element detection.
In the light of the above statements, choose the most appropriate answer from the options given below:
