Examples: di stands for two, tri for three, tetra for four OH grous, etc. In terms of determining the number of groups (without looking on the structural formula), use the nomenclature and have a closer look at the syllable. Yes, OH is a group which determine the characteristics and the structure of chemical substances (hope that answers your question). According to it, your draw is right or wrong. That is why it depends on nomenclature which is given - or the nomenclature which you want to draw. ![]() Butanediol has even more (because of four carbon atoms). In terms of dibrompropane, it may also exist: 1,3-dibrompropane or 2,3-dibrompropane, just to name two another forms. And if that is the case, your structural formulas in 2) and 3) are wrong. Say its 1,2-dibrompropane, so one bromine atom is linked with the first C-atom and the other one with the second C-atom (counted from right). As a rule it is counted from right to left, that is to say the C-atom on the right side is the first and the one on the left side the last one. Do you now what the numbers mean? they stand for the number of the carbon atoms and so for their orders. ![]() But never seen such an isomer for these chemical substances. ![]() Could you let me know if they are right? Also, are hydroxyl groups OH groups and how can you tell how many of them and when they are formed? Your structural formulas might be right, if its 1,1-dibrompropane in 2) and butane-1,1-diol in 3). (.)I have attached my attempt at the structural formulas.
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