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JEE Main levelSingle correct optionDifficulty 2 of 3nm240

What is the IUPAC name of the compound shown?

  1. A1-cyanoprop-2-ene
  2. Bbut-3-ynenitrile
  3. Cbut-2-enenitrile
  4. Dbut-3-enenitrile

Answer: D

The compound is but-3-enenitrile. The nitrile carbon is C1 and is counted in the chain, so the chain is four carbons with the double bond at C3. Treating CN as a cyano prefix (1-cyanoprop-2-ene) ignores the fact that nitrile is the principal group.
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