Question

The systematic name for neopentyl group is?

• A. 1, 1-Dimethyl
• B. neopentyl
• C. isobutyl
• D. 2, 2-Dimethylpropyl

Answer 1

The correct option is D

2, 2-Dimethylpropyl

$\stackrel{3}{C{H}_3}-\stackrel{C{H}_3}{\stackrel{|}{\underset{C{H}_3}{\underset{|}{C^2}}}}-C{\stackrel{1}{H}}_{3-}$

Shown above is the neopentyl group. When it becomes a substituent, there are 2 methyl groups at C2

It is a substituted substituent.

Hence

(d) 2,2-Dimethylpropyl

Note: the absence of 'ane'