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Problem: The partial Lewis structure that follows is for a hydrocarbon molecule. In the full Lewis structure, each carbon atom satisfies the octet rule, and there are no unshared electron pairs in the molecule. The carbon-carbon bonds are labeled 1, 2, and 3.Rank the carbon-carbon bonds in order of decreasing bond length.

FREE Expert Solution

We are asked to rank the carbon-carbon bonds in order of decreasing bond length. 

The strength of the bond between atoms increases as the number of electron pairs in the bond increases.  


The number of electron pairs that hold two atoms together is called the Bond order

For a single bond (Bond 2), the bond order is one. 

For a double bond (Bond 1), the bond order is two and for a triple bond (Bond 3) is three. 

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Problem Details

The partial Lewis structure that follows is for a hydrocarbon molecule. In the full Lewis structure, each carbon atom satisfies the octet rule, and there are no unshared electron pairs in the molecule. The carbon-carbon bonds are labeled 1, 2, and 3.

A C is double bonded (bond 1) right to C, which is single bonded (bond 2) right to C.  That C is triple bonded (bond 3) right to C.


Rank the carbon-carbon bonds in order of decreasing bond length.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Bond Energy concept. If you need more Bond Energy practice, you can also practice Bond Energy practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Tucci & Matchacheep's class at HARVARD.