When considering a Carbon-Oxygen covalent bond in an organic molecule, where is

Question

When considering a Carbon-Oxygen covalent bond in an organic molecule, where is the majority of the electron density located? A. There is no electron density in a covalent bond. B. The electron density is equally distributed between both atoms C. Most of the density is nearest the carbon atom D. Most of the electron density is nearest the oxygen atom. The color of my exam is A. Yellow or Tan or Brown B. White or Gray C. Another color D. Pink or purple E. Blue The indicated carbon atom is A. nucleophilic because it is electron-poor B. electrophilic because it is electron-poor C. electrophilic because it is electron-rich D. nucleophilic because it is electron-rich E. neither electrophilic nor nucleophilic In a reaction between 2-butanol and chloromethane, as shown below respectively, which atom or group of atoms is/are acting as an electrophile? A. The OH group on 2-butanol B. The O atom on 2-butanol C. The CH_3 group on chloromethane D. The R group on 2-butanol E. The Cl atom on chloromethane

Explanation / Answer

13. D (oxygen electronegativity is more than carbon atom. So electron density shift towards oxygen atom)

14. E

15. B (carbon is attached high electronegative bromine. So electron density shift towards bromine and carbon is electron poor)

16. C (carbon is attached to high electronegative chlorine. So electon density shift toward chlorine and carbon act as electrophile.

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