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How many sp² hybridized carbon atoms are present in one molecule of terephthalic acid?

1. 6
2. 8
3. 10
4. 12

Correct answer: 8

Solution

Terephthalic acid (benzene-1,4-dicarboxylic acid) has 8 sp² carbons: 6 from the aromatic ring (all sp² due to pi delocalization) and 2 from the two carboxyl (-COOH) groups (each carbonyl carbon is sp²).

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