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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm232

Which of the following statements about the compound shown are correct? The parent chain must contain the double bond; use NCERT-style rules.

  1. AThe parent chain has five carbons and includes the C=C bond.
  2. BIn the full name, ethyl is cited before methyl.
  3. CThe correct name is 2-ethyl-3-methylpent-1-ene.
  4. DThe compound shows cis-trans (geometrical) isomerism.

Answer: A, B

The compound is 3-ethyl-2-methylpent-1-ene. The chain CH2=C(CH3)-CH(C2H5)-CH2CH3 is pent-1-ene with methyl at C2 and ethyl at C3; ethyl precedes methyl alphabetically. The terminal =CH2 carbon carries two identical hydrogens, so there is no geometrical isomerism.
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