When are the prefixes ortho, meta, and para used?
Correct answer: C. In arenes to identify the position of the second substitution
- A. In alkynes to identify the position of the triple bond
- B. In arenes to identify the position of the first substitution
- C. In arenes to identify the position of the second substitution
- D. In all hydrocarbons to identify the position of the functional group
Explanation
The terms ortho, meta, and para are prefixes used in organic chemistry to indicate the position of non-hydrogen substituents on a hydrocarbon ring (benzene derivative). The prefixes derive from Greek words meaning correct/straight, following/after, and similar, respectively.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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