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Help on bond length

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Edit: SOLVED

 

Which substance has the greatest bond length between the carbon atoms?

A. C2H2

B. C2H4

C. C2H6

D. C2Cl4

 

Answer is C.

 

I get why the bond length of C > B > A due to single bond length > double bond length > triple bond length. However, I have no idea about the bond length of the halogenoalkene.

Help is very much appreciated, thanks!

Edited by Animate

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Well the halogenoalkane would have the same structural form as ethene, since we can just replace all the hydrogens with chlorine atoms and not change the double bond between the carbon atoms. Therefore CCl4 would have a double bond between the carbon atoms. 

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13 minutes ago, LolzDoingIB said:

Well the halogenoalkane would have the same structural form as ethene, since we can just replace all the hydrogens with chlorine atoms and not change the double bond between the carbon atoms. Therefore CCl4 would have a double bond between the carbon atoms. 

Thanks, but why is the answer C though?

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A) has C-C triple bond. B) has C-C double bond. C) has C-C single bond, D) has C-C double bond. D is not a haloalkane, but rather it is a haloalkene! Choice C is the only one with ANY C-C single bond.

In addition, question says "between carbon atoms", which refers to bonding in carbon atoms exclusively. The question doe not ask you to compare C-Cl bonds.

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7 minutes ago, kw0573 said:

A) has C-C triple bond. B) has C-C double bond. C) has C-C single bond, D) has C-C double bond. D is not a haloalkane, but rather it is a haloalkene! Choice C is the only one with ANY C-C single bond.

In addition, question says "between carbon atoms", which refers to bonding in carbon atoms exclusively. The question doe not ask you to compare C-Cl bonds.

Oh hahahaha, trick question. Thanks!

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