Question

How many primary, secondary, tertiary and quaternary carbons are present in the following hydrocarbon?
$C{H}_3-CH\left(C{H}_3\right)-C(C{H}_3{)}_2-C{H}_2-CH(C{H}_3)-C{H}_2-C{H}_3$

$\begin{array}{ccccc}& \text{Primary}& \text{Secondary}& \text{Tertiary}& \text{Quaternary}\\ \text{a)}& \text{6}& \text{2}& \text{2}& \text{1}\\ \text{b)}& \text{2}& \text{6}& \text{3}& \text{0}\\ \text{c)}& \text{2}& \text{4}& \text{3}& \text{2}\\ \text{d)}& \text{2}& \text{2}& \text{4}& \text{3}\end{array}$

• A. a
• B. b
• C. c
• D. d

Answer 1

The correct option is A a

a) $\stackrel{1^{\circ }}{C{H}_3}-\underset{1^{\circ }}{\underset{C{H}_3}{\underset{|}{\stackrel{3^{\circ }}{CH}}}}-\underset{1^{\circ }}{\underset{C{H}_3}{\underset{|}{\stackrel{1^{\circ }}{\stackrel{C{H}_3}{\stackrel{|}{\stackrel{4^{\circ }}{C}}}}}}}-\stackrel{2^{\circ }}{C{H}_3}-\underset{1^{\circ }}{\underset{C{H}_3}{\underset{|}{\stackrel{3^{\circ }}{CH}}}}-\stackrel{2^{\circ }}{C{H}_2}-\stackrel{1^{\circ }}{C{H}_3}$


$1^{\circ }\Rightarrow Primary6,2^{\circ }\Rightarrow Secondary2.$

$3^{\circ }\Rightarrow Tertiary2,4^{\circ }\Rightarrow Quanternary1.$