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Asked in PMC Practice Test 18 (2021) 2021

Which of the following suffix is used for the common naming of alkenes?

Correct answer: B. -ylene

  • A. -ene
  • B. -ylene
  • C. -yne
  • D. -eylene

Explanation

OPTION A: In the IUPAC system of alkenes, the suffix -ane of the corresponding alkane is replaced by the suffix -ene. OPTION B: The common names of the first four members are derived from those of the corresponding alkanes by replacing the ending "ane" with " -ylene". e.g. ethane (ethylene), propane (propylene). Hence, B is the correct option. OPTION C: -yne suffix is used for naming alkyne in the IUPAC system. OPTION D: Incorrect.

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About Alkenes

Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.

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