Question

The compound which has only primary and tertiary carbons are

• A. 2-methyl butane
• B. 2,3-dimethyl butane
• C. 2-chloro propane
• D. 2,2- dimethyl propane

Answer 1

The correct option is B

2,3-dimethyl butane

1 2 3 4

$C{H}_3-\underset{C{H}_3}{\underset{|}{CH}}-\underset{C{H}_3}{\underset{|}{CH}}-C{H}_3$

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.