Name the following compounds:
a.

Question

Name the following compounds:

a.

b.

Accepted Answer

All right. Hi, everyone. So this question is asking us, what are the names of the compound shown below? And here we have two substituted derivatives of phenol option A says that part one is 34 di chlorphen part two is four bromo, six methyl phenol. Option B says one or part one is 45 di chlorphen part two is four bromo six methyl phenol option C says part one is 34 di chlorphen part two is two bromo four methyl phenol. And option D says part one is 12 di chlorphen part two is one bromo, three methyl phenol. So as mentioned previously, right, the compounds being shown on the screen are substituted derivatives of phenol. Now, phenol, if you recall refers to a benzene ring with one hydroxy group attached to it. So, Finot is going to be our parent chain in this case. Now, when dealing with a substituted derivative of phenol, we have to understand the locations of our other substituents relative to the hydroxy group or the oh group. Now, because the hydroxy group is going to have the highest priority. In this case, the carbon attaching to my hydroxy group on the benzene ring is going to be labeled carbon one or both molecules. So now the direction in which I number, the rest of my ring depends on which substituent is closest. So if I consider the first ring here, my first malk compound, right, the closest substituent relative to the hydroxy group is one of my chlorine atoms that is two carbons away from my hydroxy group, whereas the other is three carbons away. So because of this, I would start numbering such that the chlorine that is closest to my hydroxy group as the label three and the other has the label for. And the reason I do this is to ensure that my substituents have the smallest position number possible. So for part one here, like we said previously, our parent chain is going to be phenol. However, because we have two of the same substituent in this case, two chlorine atoms recall that a prefix is necessary to indicate their quantity in the molecule itself, right? So a chlorine atom as a substituent is referred to as chloral in Iupac names. But because I have two chloral substituents in the same molecule, I would add a prefix dye in front of the name of my substituent. So that's di chlorophyll. And so my last step is to add position numbers specifying the locations of my substituents on the ring itself. So because I have two substituents on my phenol here, I need to have two position numbers, right? So one chloro or one of my chlorine atoms is on carbon three and the other is on carbon four. So that becomes three, comma four dash di chloral. Now notice how I'm using commas to separate numbers and dashes to separate numbers from letters. So now we can proceed with our second compound. Now, our second compound is once again another derivative of phenol. So the carbon that contains the hydroxy group is going to be labeled number one because it has the highest priority. So because I have a bromine atom on the carbon directly next to carbon one, I'm going to go ahead and number the rest of my ring structure. So that my substituent or my bromine substituent is labeled number two, right, to give it the smallest number possible. So in the case of part two, here we have two different substituents in this case, right, because we have an atom of bromine attached referred to as a bromo substituent, whereas directly opposite of the hydroxy group is a methyl substituent. So we have one bromo and we have or a bromo group and a methyl group. So now we have to discuss their position number because my bromine atom is connected to the carbon adjacent to carbon one. Here, I'm going to add its position number as two, right. So that is two dash Romo and similarly, right, my methyl group is on carbon four. So that is four dash methyl Now when assembling my Iupac name, recall that substituents when there are multiple are listed in alphabetical order. So because the B in bromo goes before the M in methyl, it would be two dash B promo dash four dash metal. Again, notice how I'm using dashes to separate numbers from letters. And then after all of my substituents have been listed, goes the name of my parent chain, which is fo so that's two bromo, four methyl phenol and there you have it right. So considering the answer choices on the screen here, the correct answer is going to be option c in the multiple choice because compound one is 34 di chlorphen and compound two is two bromo, four methyl phenol. So with that being said, thank you so very much for watching and I hope you found this helpful.

Name the following compounds:
a.
b.

Key Concepts

Nomenclature

Functional Groups

Structural Representation

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