{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

CH 221 Homework Formal Charges

CH 221 Homework Formal Charges - CH 221 College of the Holy...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CH 221 College of the Holy Cross Prof. G. Edwards Organic Chemistry I Practice Problems Jan. 27, 2004 Formal Charges Assigning Formal Charges: To find the formal charge on an atom in a molecule, first find the number of electrons “owned” by that atom. An atom will “own” all of its non-bonded electrons and half of its shared electrons. Second, compare that number with the number of valence electrons in the unbonded atom. If the numbers match, there is no charge. lfthe number of electrons “own ” by the atom in the molecule is greater than the number of valence electrons in the unbonded atom, then there will be a negative charge on the atom. If the number of electrons “owned” by the atom in the molecule is less than the number of valence electrons in the unbonded atom, then there will be a positive charge on the atom. 1. Assign formal charges, if any, in each of the following chemical species. H n H H u H a) H~(_>(‘)-(I}—H i) :6—g—g-¢—H HHH - -.: H .. P b) H-C— -H j) E; “g H/ QN/ \H l c) :lir-C—lir: H d) 171$ k) .. H H /H H—C—N—H 3:! \/_r‘\ Hfi . 1 (C T H 15’8",O\ l ' CFC/H O. ‘1 A. 2E: / \ \H e) :Cl—C-Cll H t—t ' :9]: H 9. H t) H—é‘lxg-H 1) .. iii l H‘ ‘Q—fi—F—t’“ 2C); H H 8) H H H—g—CI-p—H HH H . H h) H-C-C— ...
View Full Document

{[ snackBarMessage ]}