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BondQ[m,bond]

gives True if bond is a bond in the molecule m, and False otherwise.

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BondQ

BondQ[m,bond]

gives True if bond is a bond in the molecule m, and False otherwise.

Details

  • The bond may be a Bond or a list of two atom indices.
  • BondQ checks for the existence of a supported bond type in the molecule expression.
  • An unspecified bond order will match any bond type between the given atoms.
  • The list of atoms in bond is treated as orderless for the purposes of matching.

Examples

Basic Examples  (2)

Test whether single bonds are part of a molecule:

Wolfram Language code: m = Molecule[{Atom["C"], Atom["C"], Atom["C"], Atom["O"], Atom["H"], Atom["H"], Atom["H"], Atom["H"], Atom["H"], Atom["H"]}, {Bond[{1, 2}, "Single"], Bond[{2, 3}, "Single"], Bond[{2, 4}, "Double"], Bond[{1, 5}, "Single"], Bond[{1, 6}, "Single"], Bond[{1, 7}, "Single"], Bond[{3, 8}, "Single"], Bond[{3, 9}, "Single"], Bond[{3, 10}, "Single"]}]
Wolfram Language code: {BondQ[m, Bond[{1, 2}, "Single"]], BondQ[m, Bond[{6, 1}, "Single"]], BondQ[m, Bond[{2, 4}, "Single"]]}

Test double bonds:

Wolfram Language code: m = Molecule[{Atom["C"], Atom["C"], Atom["C"], Atom["C"], Atom["C"], Atom["C"], Atom["C"], Atom["C"]}, {Bond[{1, 2}, "Single"], Bond[{2, 3}, "Double"], Bond[{3, 4}, "Single"], Bond[{4, 5}, "Single"], Bond[{5, 6}, "Double"], Bond[{6, 7}, "Single"], Bond[{7, 8}, "Single"]}]
Wolfram Language code: {BondQ[m, Bond[{2, 3}, "Double"]], BondQ[m, Bond[{6, 5}, "Double"]], BondQ[m, Bond[{2, 4}, "Double"]]}
Wolfram Research (2019), BondQ, Wolfram Language function, https://reference.wolfram.com/language/ref/BondQ.html.

Text

Wolfram Research (2019), BondQ, Wolfram Language function, https://reference.wolfram.com/language/ref/BondQ.html.

CMS

Wolfram Language. 2019. "BondQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/BondQ.html.

APA

Wolfram Language. (2019). BondQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/BondQ.html

BibTeX

@misc{reference.wolfram_2026_bondq, author="Wolfram Research", title="{BondQ}", year="2019", howpublished="\url{https://reference.wolfram.com/language/ref/BondQ.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_bondq, organization={Wolfram Research}, title={BondQ}, year={2019}, url={https://reference.wolfram.com/language/ref/BondQ.html}, note=[Accessed: 13-June-2026]}