Which of the following is an organic acid? ch3cooh c2h6o ch2o ch4

Answer : The correct option is,

Explanation :

Organic acid : It is an organic compound that has acidic properties.

The common organic acid is the carboxylic acid. The acidity of carboxylic acid  is associated with their carboxyl group (-COOH).

(a) :

It belongs to carboxylic acid functional group in which the the group is directly attached to the alkyl group.

(b) :

It belongs to an aldehyde functional group in which the the group is directly attached to the hydrogen.

(c) :

It belongs to an alcoholic functional group in which the the group is directly attached to the alkyl group.

(d) : It is a methane molecule.

Hence, an organic acid is

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.