Question

What is the IUPAC name of CH3-CH=CH-CH2Cl?

Answer 1

Answer:

The IUPAC name of CH₃-CH=CH-CH₂Cl is 1-Chlorobut-2-ene.

Explanation:

Basics of IUPAC nomenclature system:

Any IUPAC name for a chemical compound contains 4 distinct parts:

• Prefix
• Word root
• Primary suffix
• Secondary suffix

∴ IUPAC name = Prefix + Word root + Primary suffix + Secondary Suffix

1. Prefix: This is always written before the word root.
   -It denotes whether a compound is cyclic or acyclic. If 'cyclo' is written in front then it essentially denotes that the compound is cyclic. This is also known as the primary suffix.
   - It contains branched-chain substituents like methyl, ethyl, etc. Also, certain functional groups like halogens (Halo), -NO₂ (Nitro), etc. are also treated as substituents and thus placed as a prefix.
2. Word root: This basically contains the number of carbon atoms the compound comprises of in its longest chain.
3. Primary suffix: It shows the saturation or unsaturation status of the organic compound.
   '-ane' for alkanes
   '-ene' for alkenes
   '-yne' for alkynes
4. Secondary suffix: This indicates the presence of a particular functional group in the longest carbon chain. E.g., '-ol' in case the compound contains an alcoholic/hydroxyl group.

Rule of priority in IUPAC nomenclature:

The sequence of priority while naming the compounds wrt IUPAC nomenclature is:

Functional Group > Double bond > Triple bond > Substituents

As per this rule, the individual 'groups', i.e., the functional groups/double bond/triple bond should be given priority as per the sequence and the numbering of the compound should be in such a way that the functional group/double bond/triple bond are given the least number possible as per the rule of priority.

Now, let us name the compound given in the question as per IUPAC rules:

CH₃-CH=CH-CH₂Cl

As discussed above, Cl is treated as a substituent here, and so while numbering the compound, the double bond will be given preference.
∴ The numbering of the compound will be:

⁴CH₃-³CH=²CH-¹CH₂Cl

Thus, the compound would be named 1-Chlorobut-2-ene.

Learn more at:

What are primary and secondary suffixes as applied to IUPAC nomenclature?
https://brainly.in/textbook-solutions/q-primary-secondary-suffixes-applied-iupac-nomenclature

Write the rules of naming a compound in IUPAC Nomenclature.​
https://brainly.in/question/52421966

#SPJ3