In which of the following molecules is the bond length the shortest?

In which of the following molecules is the bond length the shortest?

Step 1: Understand that bond length refers to the distance between the nuclei of two bonded atoms.
Step 2: Recognize that different types of bonds (single, double, triple) have different lengths.
Step 3: Know that triple bonds are shorter than double bonds, which are shorter than single bonds.
Step 4: Identify the molecule C2, which has a triple bond between two carbon atoms.
Step 5: Compare C2 with other molecules that may have single or double bonds.
Step 6: Conclude that since C2 has a triple bond, it has the shortest bond length among the options.

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