need help with the fischer projection

[biostudent101]

how do i know which atom or compound takes priority over another?
Also, is it true,in regards to priority, Br>OH....why? is it because of the atomic #?
Thanks!

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[lazybummy]

it depends on the immediate atom that it is attached to.. and it's by atomic number. Higher atomic number = higher priority. If the immediate atoms are the same.. then go to the next one and compare their atomic number.

 

[bbwreckerz04]

how do i know which atom or compound takes priority over another?
Also, is it true,in regards to priority, Br>OH....why? is it because of the atomic #?
Thanks!

Yes, it's by atomic number. You actually only compare the Br>O.

Edit: Its actually atomic number, atomic weight is when you have similar isotopes.

 

[Talib]

it is always the atom that is attached to the C u look at immediately, u look on the compound if u have the same atom attached to the C