Draw the straight-chain isomer with the formula (b) C 9 H 20 .

All right. Hi everyone. So this question says to draw the structural formula of the straight chain isomer of the compound with the molecular formula C 12 H 26. Now recall first and foremost that a structural formula shows how atoms in a given compound are connected to each other. Now, they're very similar to Lewis structures in that sense, except when it comes to a structural formula, we do not show any electron piers. So very similar principle to a Lewis structure except no electron pairs are actually shown. No, just to confirm very quickly recall that all all canes have a structural formula of or molecular formula of CNH two N added to two where N is the number of carbons, right? So according to the molecular formula given N is equal to 12. So that's C 12, each two multiplied by 12 added to two. And this gives me the molecular formula of C 12 H 26. Now, the reason why I did this is to make sure that the compound we are to draw is actually an all can. So the idea here was to just confirm that there are no double or triple wands present in this molecule. So this is in fact an all king out because we are specifically drawing the straight chain isomer, then all 12 carbon atoms are going to be connected to each other in a straight line, 456789, 10, 11 and 12. So our next step is to go ahead and add all 26 hydrogens to the 12 carbons and recall that we do this to make sure that carbon has four bonds in total in line with its general preference, right. So the pattern that follows is that the carbons on either end of the chain require three hydrogens to ensure that it has all four bonds that it needs. Right? So the first carbon and the 12th carbon are each going to have three hydrogens to ensure that it has four bonds. And then because each internal carbon has two bonds to other atoms, each one is going to require two hydrogens again to make sure that it has or bots almost done here, right? Two hydrogens to each internal carbon and doing this should be add up to 26 hydrogens and there you have it, right. So here is the structural formula for the straight chain isomer of the compound with the molecular formula of C 12 H 26. And with that being said, thank you so very much for watching. And I hope we found this helpful

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12. Introduction to Organic Chemistry

Structural Formula

GOB Chemistry

12. Introduction to Organic Chemistry

Structural Formula

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Problem 3b

Textbook Question

Draw the straight-chain isomer with the formula (b) C₉H₂₀.

Verified step by step guidance

Step 1: Understand the problem. The molecular formula C₉H₂₀ represents an alkane, as it follows the general formula for alkanes, CₙH₂ₙ₊₂. A straight-chain isomer means the carbon atoms are connected in a continuous chain without branching.

Step 2: Determine the number of carbon atoms. Since the formula is C₉H₂₀, there are 9 carbon atoms in the molecule. Arrange these carbon atoms in a straight chain.

Step 3: Add hydrogen atoms to satisfy the valency of each carbon atom. Each carbon atom forms 4 bonds. Ensure that the total number of hydrogen atoms adds up to 20, as specified in the molecular formula.

Step 4: Verify the structure. Count the total number of carbon and hydrogen atoms in the structure to ensure it matches the molecular formula C₉H₂₀. Also, confirm that all carbons have 4 bonds and hydrogens have 1 bond.

Step 5: Draw the structure. Represent the straight-chain isomer by writing the carbon atoms in a line and attaching the appropriate number of hydrogen atoms to each carbon. For example, the structure can be written as CH₃-CH₂-CH₂-CH₂-CH₂-CH₂-CH₂-CH₂-CH₃.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Isomerism

Isomerism refers to the phenomenon where two or more compounds have the same molecular formula but different structural arrangements or spatial orientations. In the case of C₉H₂₀, isomers can differ in the connectivity of carbon atoms, leading to variations in their physical and chemical properties.

Straight-Chain Hydrocarbons

Straight-chain hydrocarbons are organic compounds consisting of carbon atoms connected in a linear arrangement, with hydrogen atoms filling the remaining valences. For C₉H₂₀, the straight-chain isomer would be nonane, which has nine carbon atoms in a continuous chain, representing the simplest structural form of this molecular formula.

Structural Representation

Structural representation involves depicting the arrangement of atoms within a molecule, often using line-angle formulas or condensed structural formulas. For C₉H₂₀, drawing the straight-chain isomer requires accurately illustrating the nine carbon atoms and their associated hydrogen atoms to convey the molecule's structure clearly.

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