19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The oxygen is estimated in the organic compound by
Which of following will give Lassaigne’s test for nitrogen
Which of the following compounds will answer Lassaigne’s test for nitrogen
Among the following which compound gives precipitate with AgNO3 solution? (a) (b) (c)
Phenol and benzoic acid can be separated by
Which of the following test can use for separation of alcohol and phenol?
Seliwanoff’s test is used for the distinguish:
Barfoed test is used for the distinguish:
An organic compound is heated with HNO2 at 0oC 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.
Which of the following observations is correct and is used in the identification of carboxylic acids?
Esters undergo hydrolysis in Presence of KOH
Acids reacts with KOH to form salt.
Phenols contains acidic H it reacts with KOH.
Amines are basic. Therefore, do not react with KOH.
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)
0.30 g of an organic compound containing C, H and O on combustion yields 0.44 g CO2 and 0.18 g H2O. If one mole of compound weighs 60, then molecular formula of the compound is (Karnataka CET 2015)
Assertion (A): A mixture of o-nitrophenol and p- nitrophenol can be separated by steam distillation Reason (R): p-Nitrophenol is steam volatile while o- nitrophenol is not steam volatile. (AIIMS 2015)
The most suitable method of separation of 1: 1 mixture of ortho and para-nitrophenols is (NEET 2017)
Paper chromatography is an example of : (NEET 2020)
Phenol + Phthalic anhydride Conc.H SO fusion B. -> B gives which of the following colour in alkaline medium?
Among the following, which statement is not correct? (a) || H C C OH O will not respond to haloform test
To separate a mixture of amines from each other, one should follow:
1.2 g of organic compound of Kjeldalization liberaze ammonia which consumes 30 cm3 of 1N HCl. The percentage of nitrogen in the organic compound is (KCBT 2011)
The Lassiaigne’s extract is boiled with conc. HNO3 while testing for halogens. By doing so it (AIPMT Prelim 2011)