The laboratory process of distillation does not involve

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

im doing test rn im going with 2 but ill give answer if itss wrong,   : )