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.

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
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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
