1 Consider the first atom of each part of the molecule. An atom with higher atomic number has higher priority. (e.g. I > Cl > C > H)  If the first atom of two groups is the same, consider the second atom(s) in the same way as the first. (e.g. -C(CH3)3 > -CH(CH3)2 > -CH2CH3 > -CH3).
1 You can also use a toilet plunger on your bathroom sink. 2  Fill up the sink with water first, the use the plunger vigorously on the drain just as you would a toilet. 3  This will lift and agitate any blockage in the drain. It will smell a bit like vinegar for about a day. 2  You can also use a toilet plunger on your bathroom sink. 3  Fill up the sink with water first, the use the plunger vigorously on the drain just as you would a toilet.
Remove the strainer or sink pop-up stopper. 1  If there is a strainer over the drain, as in a tub or shower, remove the screws securing it and pry it up with a screwdriver. 2  Be careful to keep the screws from falling down the drain. 3  You can remove some pop-up sink stoppers by twisting and lifting them out.lock the overflow opening on a tub or sink with a wet cloth. If you're working on a sink, block the drain and overflow of any adjacent basin. Blocking these openings helps focus the force of the plunger toward the blockage.