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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm146

Select the correct statements about spiro[4.5]dec-6-ene.

  1. Athe spiro atom is C-6
  2. Bnumbering begins in the six-membered ring
  3. CC-1 and C-4 are the five-membered-ring atoms bonded to the spiro atom
  4. Dits molecular formula is

Answer: C, D

Numbering starts in the smaller ring: C-1 to C-4 are the cyclopentane carbons, C-5 is the spiro atom and C-6 to C-10 are the cyclohexene carbons. So C-1 and C-4 flank the spiro atom, and the statements about C-6 being spiro and numbering starting in the larger ring are false. Formula: 10 C, DU = 2 rings + 1 C=C = 3, so H = 22 - 6 = 16.
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