The brown ring test for nitrates depends on :
the reduction of nitrate to nitric oxide
oxidation of nitric oxide to nitrogen dioxide
reduction of ferrous sulphate to iron
oxidising action of sulphuric acid
A.
the reduction of nitrate to nitric oxide
The brown ring is obtained due to the formation of pentaaquanitrosonium ion. In this reaction reduction of nitrate ion by Fe2+ ion takes places as
An organic compound which produces a bluish green coloured flame on heating in presence of copper is :
chlorobenzene
benzaldehyde
aniline
benzoic acid
For a reaction A+ B → C + D if the concentration of A is doubled without alterning the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without alterning the concentration of A, the rate gets tripled. The order of the reaction is :
2
1
3/2
4/3
The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on an alcohol is:
anhydrous AlCl3
FeCl3
anyhydrous ZnCl2
Cu
Which of the following compound would not evolve CO2 when treated with NaHCO3 solution?
Salicylic acid
Phenol
Benzoic acid
4-nitrobenzoic acid
Identify the product Y in the following reaction sequence:
pentane
cyclobutane
cyclopentane
cyclopentanone
The reaction C2H5ONa + C2H5I → C2H5OC2H5 + NaI is known as:
Kolbe's synthesis
Wurtz's synthesis
Williamson's synthesis
Grignard's synthesis
The basicity of aniline is less than that of cyclohexylamine. This is due to :
+R-effect of-NH2 group
-I effect of -NH2 group
-R effect of-NH2 group
hyperconjugation effect
Which of the following compound is expected to be optically active?
(CH3)2CHCHO
CH3CH2CH2CHO
CH3CH2CHBrCHO
CH3CH2CBr2CHO