Are These Condensed Structural Formulas for C7H16 Correct?

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SUMMARY

The discussion focuses on identifying correct condensed structural formulas for three constitutional isomers of the molecular formula C7H16. The participants confirm that 2-methylhexane (CH3CH(CH3)(CH2)3CH3) and 3-methylhexane (CH3CH2CH(CH3)(CH2)2CH3) are correct. However, the third proposed structure, initially labeled as 3-ethylpentane (CH3CH(CH2)(CH3)CH2CH3), is corrected to 2-ethylbutane (CH3CH(CH2CH3)CH2CH3), which is also referred to as 3-methylpentane. The discussion clarifies that the molecular formula C7H16 corresponds to these isomers.

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aatari
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Hi Guys, I attempted the question below and just need someone to have a look to make sure there are no mistakes.

1. Homework Statement
Write condensed structural formulas and the names for three constitutional (i.e. structural) isomers with the molecular formula C7H16.

Homework Equations


None.

The Attempt at a Solution


CH3CH(CH3)(CH2)3CH3 - 2-methylhexane

CH3CH2CH(CH3)(CH2)2CH3 - 3-methylhexane

CH3CH(CH2)(CH3)CH2CH3 - 3-ethylpentane
 
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Last one is wrong, you have two separate substitutents on the second carbon, not an ethyl.
 
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aatari said:
CH3CH(CH2)(CH3)CH2CH3 - 3-ethylpentane
So it should be CH3CH(CH2CH3)CH2CH3?
 
That is 2-ethylbutane (AKA 3-methylpentane, naming it by the longest chain).
 
aatari said:
So it should be CH3CH(CH2CH3)CH2CH3?

Isn't that C7H15 ?

And isn't there a very simple C7H16?
 

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