A boy has a few bottles of soft drink in his restaurant. But ,unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and the third one wants neutral drink. How will the boy decide it to be served to whom?

Explanation:

The boy with the help of litmus paper can easily decide it as follows:

(i) The drink that would turn a red litmus to blue would surely be basic in nature.

(ii) The drink that turns a blue litmus to red is be acidic in nature.

(iii) The drink that would not be affected by both red and blue litmus would is  neutral in nature.

The test can be done with help of phenolphthalein or the methyl orange these reagents also show different color in different medium.

it is the most commonly accepted one

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.