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.
However, most stopped-up sinks and plugged toilets can be fixed without calling in a plumber. What you need to complete the job on your own are the right tools and a little determination. We'll show you how to clear stubborn clogs in a kitchen sink, bathtub, toilet and floor drain. These proven techniques will dislodge virtually any clog. Remember, if you can't clear a clog after a few attempts, turn the job over to a drain-cleaning service or licensed plumber.