Question

which hydrocarbons burn with 1) non sooty blue flame and 2)sooty yellow frame?
what happens when metane reacts with chlorine?
what is rectified spirit?
why does soap not work in hard water?

Answer 1

alkanes burn with a non-sooty blue flame.
alkenes and alkynes burn with a sooty yellow flame.
when chlorine reacts with methane it produces chloromethane.
rectified spirit is a highly concentrated ethanol also known as neutral spirit.
soap does not work in hardwater because it does not contain sulphonate and magnesium salts.