which of the following test can help to distinguish between aldehyde and carboxylic acid in given mixture of compound? A. Hydrolysis B. 2,4 DNPH test C. Fehling solution D. Idoform test

In a clean test tube mix together equal volumes of Fehling’s solution A and Fehling’s solution B. The resultant Fehling’s test reagent should be a clear dark blue solution. Add 5 drops of this test reagent to about 1 cm 3 of sodium carbonate solution in a test tube containing a few anti-bumping granules and then add about 1 cm 3.

Explanation:

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.