Question

Which of the following compounds has all the four types (1^∘, 2^∘, 3^∘ and 4^∘) of carbon atoms?

• A. 2,3,4-Trimethylpentane
• B. neo-Pentane
• C. 2,2,4-Trimethylpentane
• D. None of the three

Hint:

Carbon classification: • 1^∘: attached to one carbon • 2^∘: attached to two carbons • 3^∘: attached to three carbons • 4^∘: attached to four carbons

Answer 1

The Correct Option is C

Step 1: 2,2,4-Trimethylpentane (isooctane) contains: • Primary carbons (1^∘) in methyl groups • Secondary carbon (2^∘) in the chain • Tertiary carbon (3^∘) at C-4 • Quaternary carbon (4^∘) at C-2
Step 2: Other options lack at least one type of carbon.