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Catya
The way this should be written is :

(CH3)2CHCH2CH2CH3

Start numbering carbons at the end closest to methyl group. The chain is 5 carbons (pent = 5) long with methyl group on carbon 2.

2-methylpentane

Answer:

2-methylpentane

Explanation:

ch3 - ch3 - ch- ch2- ch2-ch3

           H      

     H   C   H   H   H   H

H - C - C - C - C - C - C - H

     H   H   H   H   H   H

C6H14

Longest chain of C is 5 so Pent

Methyl group on 2nd carbon

So it's 2-methylpentane