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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm163

Select the correct statements about the isomers of (alkenes and cycloalkanes).

  1. Apent-1-ene and 2-methylbut-1-ene are chain isomers
  2. Bpent-1-ene and pent-2-ene are position isomers
  3. Cpent-1-ene and cyclopentane are ring-chain isomers
  4. Dpent-1-ene and pent-2-ene are metamers

Answer: A, B, C

Open-chain alkene versus ring is ring-chain isomerism; moving the double bond in an unchanged skeleton is position isomerism; changing the skeleton (straight versus branched) is chain isomerism. Metamerism needs a polyvalent atom with different alkyl groups, such as ethers, so it does not apply to alkenes.
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