Question

The compound which has only primary and tertiary carbons is?

• A. 2-methylbutane
• B. 2,3-dimethylbutane
• C. 2-chloropropane
• D. 2,2- dimethylpropane

Answer 1

The correct option is B

2,3-dimethylbutane

$C^1{H}_3-\underset{C^2{H}_3}{\underset{|}{C^{3}H}}-\underset{C^4{H}_3}{\underset{|}{C^{5}H}}-C^6{H}_3$

Carbons labelled 2 & 3 are tertiary carbons, it is carbon attached with 3 other carbon atoms and rest of the carbons are primary in nature.