How do you name and draw 5 compounds that have the formula #C_7H_7Br#?
1 Answer
Jul 12, 2016
Well, you know that an alkane would have the general formula
That means you should try drawing alkenes and alkynes, and definitely try rings.
- I tried a five-membered ring with two sidechain carbons, and added conjugated double bonds to decrease the number of hydrogens. That's one isomer.
- I tried drawing a six-membered ring with one sidechain carbon. When I placed a bromine on that carbon, I achieved
#C_7H_7Br# . I moved the bromine onto the ring for another isomer, and moved that bromine around the ring for two more isomers for a total of five.
Seems like there are at least 14 though. If you want, three of them are bromoene-ynes, which can be a challenge to name.
From left to right, top to bottom:
- 2-methyl-bromobenzene, or o-bromotoluene, or 1-bromo-2-methylbenzene
- 3-methyl-bromobenzene, or m-bromotoluene, or 1-bromo-3-methylbenzene
- 4-methyl-bromobenzene, or p-bromotoluene, or 1-bromo-4-methylbenzene
- I'm not sure how to name this one, so I looked it up and got:
5-(1-bromoethylidene)-1,3-cyclopentadiene
This uses cyclopentadiene as the parent compound, and an ethylidene substituent (
#"C"=stackrel("*")("C")-"CH"_3# , with bromine on the starred carbon), and the upper-left carbon on cyclopentadiene is carbon-1; we'd move counterclockwise.
- benzyl bromide, or bromomethylbenzene