Using the basic operations file, determine the bond length for the C=C bond, labeled a, and the C-C bond, labeled b, in the propene molecule. Report the numerical values exactly as seen in Spartan.

double bond a = [Fill in the blank],
Angstroms

single bond b = [Fill in the blank],
Angstroms

Question

Using the basic operations file, determine the bond length for the C=C bond, labeled a, and the C-C bond, labeled b, in the propene molecule. Report the numerical values exactly as seen in Spartan.

double bond a = [Fill in the blank],
 Angstroms

single bond b = [Fill in the blank],
 Angstroms

BlackTom AI · Accepted Answer

This question asks you to report the bond lengths for two specific bonds in propene using the basic operations file and to provide the numbers exactly as seen in Spartan. However, the provided data field for answer options is empty, so there are no multiple-choice choices to analyze here.

What you would typically examine:
- Bond a: the C=C bond in propene. In standard chemistry data, a carbon–carbon double bond (sp2–sp2) is shorter than a single bond, with a typical length around 1.33 Å in many hydrocarbons. In computational outputs like Spartan, the value can be very close to this, often falling in the 1.31–1.34 Å range depending on the basis set and optimization details.
- Bond b: the C–C bond that is a single bond linking the second carbon of the double bond to the terminal carbon (the CH2–CH group in CH2=CH–CH3). A standard C–C single bond length is about 1.54 Å, with slight variation (roughly 1.50–1.54 Å) depending on the environment and computational method.

If you run the Spartan calculation and obtain outputs exactly as shown in Spartan, you should transcribe those numbers verbatim into the two blanks:
- double bond a = [Spartan output value for the C=C bond], Angstroms
- single bond b = [Spartan output value for the C–C single bond], Angstroms

Common sources of error or misconception to avoid:
- Do not confuse the C=C bond length with a typical C–C single bond length; they differ noticeably in length due to bond order.
- Do not guess numbers if Spartan provides a numeric value with specific formatting; copy exactly as shown, including any trailing digits.
- If Spartan outputs more than one value (e.g., optimized geometry vs. initial guess), ensure you are using the finalized optimized bond lengths for the labeled bonds a and b.

In the absence of the Spartan values here, you can prepare by noting the expected approximate ranges: a ≈ 1.33 Å and b ≈ 1.54 Å, and then replace with the exact Spartan numbers once you view the output.

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