19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
If N and S both are present in an organic compound during Lassaigne’s test, both will change into
An organic compound contains C, H, N, S and Cl. For the detection of chlorine, the sodium extract of the compound is first heated with a few drops of concentrated HNO₃ and then AgNO₃ is added to get a white ppt. of Ag…
Which of the following will not give test for ‘N’ in sodium extract?
Azeotropic distillation is used only to seperate azeotropes ie. constant boiling mixture. Here acetone & CCl₄ are not azeotropic mixture. Hence (a) is not correct.
Compounds which do not contain halogen but give positive Beilstein test?
Sulphur is estimated by Carius method in the form of
Column I Column II (pair of compounds) (test to distinguish) (a) OH and OH (p) Liebermann’s nitroso test (b) (c) and NH₂ Me Me NH (r) Iodoform (d) CH₃– CH₂ – CHO (s) Lucas and CH₃– CHO (t) NaHSO₃
Lassaigne’s test is not shown by diazonium salts. Why?
Which of the following statements is wrong?
Sodium nitrorusside Na₂[Fe(CN)₅NO] is used as reagent for detection of ______ and the compound formed is ____.
Barfoed test is used for the distinguish:
The prussian blue colouration obtained in the test for nitrogen in the organic compound is
CCl₄ & acetone differ in their boiling Point. So it can be seperated through fractional distillation. Hence (b) is correct.
The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (CBSE AIPMT 2011)
Among the following which compound gives precipitate with AgNO₃ solution? (a) (b) (c)
Phenols contains acidic H it reacts with KOH.
Which of the following observations is correct and is used in the identification of carboxylic acids?
An organic compound is heated with HNO₂ at 0 °C and then the resulting solution is added to a solution -napthol whereby a brilliant red dye is produced. The observations indicate that the compound possesses.
The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it (CBSE AIPMT 2011)
KOH can be used as a drying agent for
In the Lassaigne’s test for the detection of nitrogen in the organic compound, the appearance of blue coloured compound is (West Bengal PMT 2015)
The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)
Which of the following is the test of primary amine?
Paper chromatography has following mobile and stationary phases respectively (Bihar CECE 2015)
Paper chromatography is an example of : (NEET 2020)