Question:

The compound with molecular formula C6_6H6_6, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has ___ π\pi electrons.

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Aromatic compounds like benzene (C6_6H6_6) have a conjugated system of π \pi -electrons that satisfy Hückel's rule, which states that aromatic compounds have 4n + 2 π \pi -electrons (where n is a whole number).
Updated On: Mar 18, 2025
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Correct Answer: 6

Solution and Explanation

The compound with the molecular formula C6_6H6_6 is benzene, which is a well-known aromatic compound. Benzene has a planar ring structure with alternating single and double bonds between the carbon atoms, forming a conjugated system. Each carbon-carbon double bond contributes 2 π \pi -electrons. Since benzene has 6 carbon atoms, and all of them participate in the conjugation, the total number of π \pi -electrons in benzene is 6. Thus, the answer is: The number of π electrons=6 \text{The number of } \pi \text{ electrons} = 6
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