Sodalime test is used to detect the following element in an organic compound ?

Arrange the carbanions, , in order of their decreasing stability 

If two compounds have the same empirical formula but different molecular formulae, they must have

The alkene that exhibits geometrical isomerism is

When mixture of potassium cyanate and ammonium chloride is heated, it gives

An organic compound contains  C = 40%  O = 53.3%  and H = 6.60% . The empirical formula of the compound is

Anthracene is purified by

The kind of valency that exists in CaH₂  and  C₂H₂ is

The IUPAC name of the compound C₆H₅COCl is