A pentacordinate carbon is a transient species in what mechanism?
1. Sn1
2. Sn2
3. E1
4. E2

Howdy schem-ga,

The Google HTML version of this web page provides the correct choice.
http://64.233.161.104/search?q=cache:H5E9-NCOfW0J:140.120.9.250/cyyeh/Org-ChemEng/chapter8.doc+%22pentacoordinate+carbon%22+transient

8-10 A pentacoordinate carbon is a transient species in the _____ mechanism.

1) SN1       2) SN2       3) E1       4) E2

ANSWERS ... 8-10: 2) SN2

This can be verified by looking at this HTML version of a slide from a
University at Albany PowerPoint presentation on alkyl halides.
http://www.albany.edu/faculty/musah/achm216a/presentations/chapter6/tsld012.htm

"Bimolecular (SN2) Nucleophilic Substitution
...
- pentacoordinate carbon in transition state"

If you need any clarification, feel free to ask.


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