Respuesta :

Answer:

The correct name is 5-chloro-2-pentyne.

Explanation:

  • Kindly see the attached image.
  • It summarizes the rules of IUPAC system to name the compounds.
  • We have 5 carbon atoms that take the name (pent).
  • The carbon skeleton should be numbered that the position of the triple bond should have the lowest number in the skeleton, so the triple bond is between C2 and C3.
  • It takes the lowest number (2) and added (yne) at the end of the name.
  • (yne) is express the presence of triple bond.
  • The (Cl) atom take the number 5.
  • So, the correct name of the compound is 5-chloro-2-pentyne.
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5-chloro 2 pentyne is the correct name of the compound that is incorrectly named 1-chloro-3-pentyne

Whereas the triple C atom should get the smallest number, so the triple C name should start from the left,  to be: 5-chloro 2 pentyne

Further explanation

The rules for alkyne naming compounds are almost the same as alkanes, namely:

  • 1. The longest chain is the chain that has the most C atoms that have a double bond in it
  • 2. Naming the triple bond from the main chain based on the location of the C atom which has a triple bond
  • 3. Numbering starting from C atoms which have triple bonds gets the smallest value
  • 4. Branch chains are named according to the number of Coms with the name alkyl

Alkyne's general formula is CnH2n-2

It is known that the problem is 1-chloro-3-pentyne, then the structure is

CH₃ CH₂ ≡ CH₂ CH₂ CH-Cl

  ⁵      ⁴          ³      ²      ¹

From the description according to the above formula, it shows that the triple C number is obtained from right to left, whereas the triple C atom should get the smallest number, so the triple C name should start from the left,  to be: 5-chloro 2 pentyne

CH₃ CH₂ ≡ CH₂ CH₂ CH-Cl

  ¹       ²          ³      ⁴      ⁵

Learn more

Describe that alkynes are more unsaturated compounds

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all correct statements concerning pentyne

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he alkane formed when 4,5,5-trimethyl-1-hexy-treated with two equivalents of hbr.

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Keywords: alkynes, 5-chloro 2 pentyne

Ver imagen ardni313