Are These Condensed Structural Formulas for C7H16 Correct?

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Discussion Overview

The discussion revolves around the correctness of condensed structural formulas for three constitutional isomers of the molecular formula C7H16. Participants are examining the structural representations and naming conventions associated with these isomers.

Discussion Character

  • Homework-related
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant presents three condensed structural formulas for C7H16, identifying them as 2-methylhexane, 3-methylhexane, and 3-ethylpentane.
  • Another participant challenges the correctness of the last formula, claiming it incorrectly represents two separate substituents on the second carbon instead of an ethyl group.
  • A subsequent reply suggests an alternative representation for the last isomer, proposing it should be written as CH3CH(CH2CH3)CH2CH3.
  • Another participant identifies this alternative as 2-ethylbutane, also noting it can be referred to as 3-methylpentane based on the longest chain.
  • There is a question raised about whether the proposed structure corresponds to C7H15, and a participant inquires about the existence of a simpler structure for C7H16.

Areas of Agreement / Disagreement

Participants express disagreement regarding the correctness of the last proposed structural formula and its naming. There is no consensus on the accurate representation of the isomers or the implications of the molecular formula C7H16.

Contextual Notes

Participants have not resolved the definitions of the isomers or the implications of the molecular formula, leading to uncertainty in the discussion.

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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