Question

what is the structure of 2 - methylhexane?
(ch3)2chch2ch2ch3
(ch3)2chch2ch2ch2ch3
(ch3)3cch2ch2ch2ch3

question 4 (10 points)
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what is the iupac name of this compound?
ch3ch
ch3 - ch - ch - ch2ch2ch3
ch3
2 - methyl - 3 - propylpentane
3 - ethyl - 2 - methylhexane
2 - methyl - 3 - ethylhexane
4 - ethyl - 5 - methylheptane
4 - ethyl - 5 - methylhexane
question 5 (10 points)
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Explanation:

Question 1: What is the structure of 2 - methylhexane?

2 - methylhexane has a hexane (6 - carbon) main chain with a methyl ($-CH_3$) group attached to the second carbon atom. The correct structure in condensed - formula is $(CH_3)_2CHCH_2CH_2CH_2CH_3$. The first option is 2 - methylpentane, the third option is 2,2 - dimethylhexane. In the line - bond structures, the correct one has a 6 - carbon chain with a branch at the second carbon.

First, find the longest carbon - chain. Here, the longest chain has 6 carbon atoms (hexane). Then, number the chain to give the substituents the lowest numbers. There is a methyl group ($-CH_3$) at the 2 - position and an ethyl group ($-CH_2CH_3$) at the 3 - position. According to IUPAC rules, substituents are listed in alphabetical order.

Answer:

$(CH_3)_2CHCH_2CH_2CH_2CH_3$

Question 4: What is the IUPAC name of this compound?