Question

The IUPAC name of \( CH_3-CH_2-CH_2-CH_3 \) is:

• A. Butane
• B. Butene
• C. Isobutane
• D. Butyne

Hint:

Hydrocarbon naming shortcuts:
• 1 Carbon \( \rightarrow \) Meth-
• 2 Carbons \( \rightarrow \) Eth-
• 3 Carbons \( \rightarrow \) Prop-
• 4 Carbons \( \rightarrow \) But- Suffixes: \[ -ane,\ -ene,\ -yne \] represent single, double, and triple bonds respectively.

Answer 1

The Correct Option is A

Concept:
IUPAC nomenclature is the systematic method of naming organic compounds. For hydrocarbons:
• Prefix indicates number of carbon atoms
• Suffix indicates type of bonding Important suffixes:
• \( -ane \rightarrow \) Single bonds
• \( -ene \rightarrow \) Double bond
• \( -yne \rightarrow \) Triple bond

Step 1: Count the number of carbon atoms.
Given compound: \[ CH_3-CH_2-CH_2-CH_3 \] Total carbon atoms: \[ 4 \] The prefix for four carbon atoms is: \[ \text{But-} \]

Step 2: Identify the type of bonds present.
All bonds between carbon atoms are single bonds. Therefore, the compound belongs to alkane family. Suffix used for alkanes: \[ -ane \]

Step 3: Write the IUPAC name.
Combining prefix and suffix: \[ \text{But} + \text{ane} \] \[ = \text{Butane} \]

Step 4: Examine the remaining options.
Option (B): Butene
Contains double bond. Incorrect. Option (C): Isobutane
Branched chain compound. Given structure is straight chain. Incorrect. Option (D): Butyne
Contains triple bond. Incorrect.

Step 5: Choose the correct answer.
Therefore, the correct IUPAC name is: \[ \boxed{\text{Butane}} \] Hence, \[ \boxed{(1)\ \text{Butane}} \]