Question

The IUPAC name of allylamine is

• A. But-2-en-1-amine
• B. But-1-en-2-amine
• C. Prop-2-en-1-amine
• D. Prop-1-en-2-amine
• E. 2-Amino 1-propene

Hint:

Allyl group = 3 carbons with a double bond at the end.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
We need to determine the systematic IUPAC name for the compound with the common name "allylamine". This requires knowing the structure of the allyl group and applying IUPAC nomenclature rules for amines.
Step 2: Key Formula or Approach:
1. Identify the Structure: The "allyl" group is CH\(_2\)=CH-CH\(_2\)-. Allylamine is therefore CH\(_2\)=CH-CH\(_2\)-NH\(_2\). 2. IUPAC Rules for Alkenamines: - Find the longest carbon chain that contains the double bond. - Number the chain to give the principal functional group (the amine, -NH\(_2\)) the lowest possible number. - The name is constructed as: [alk]-[chain number of double bond]-en-[chain number of amine]-amine. Step 3: Detailed Explanation:
The structure is: \[ \text{CH}_2=\text{CH}-\text{CH}_2-\text{NH}_2 \] 1. Longest Chain: The longest carbon chain containing the double bond has 3 carbons. The parent alkane is propane, so the parent alkene is propene. 2. Numbering: We need to number the chain to give the -NH\(_2\) group the lowest possible number. \[ \overset{3}{\text{C}}\text{H}_2=\overset{2}{\text{C}}\text{H}-\overset{1}{\text{C}}\text{H}_2-\text{NH}_2 \] Numbering from right to left gives the amine group position 1. 3. Locants: - The amine group is on carbon 1. - The double bond starts on carbon 2. 4. Construct the Name: - Parent alkene: Propene - Position of double bond: 2-en - Position of amine: 1-amine Combining these parts gives: Prop-2-en-1-amine. Step 4: Final Answer:
The IUPAC name of allylamine is Prop-2-en-1-amine.