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Ortho, meta and para
1. Ortho (or 1, 2-) : if the two substituents are on the adjacent carbon atoms, the compound is said to be ortho (or 1, 2-).
2. Meta (or 1, 3-) : if the two substituents are on alternate carbon atoms, the compound is said to be meta or (1, 3-).
3. Para (or 1, 4-) : if the two substituents are on diagonally situated carbon atoms, the ompound is said to be para or (1, 4-).
Ortho, meta and para are generally displayed as o-, m- and p- correspondingly.
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