F is a cyclic compound. How many atoms are present in the ring?
A
2
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B
4
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C
6
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D
8
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Solution
The correct option is C 6
When 3-methylpentanedioic acid is heated with acetic anhydride, 4-methyldihydro-2H-pyran-2,6(3H)-dione (compound F) is obtained. Since the ring has 6 atoms, the answer is 6.