6. (5 pts) Which of the following is not a characteristic of a carbonyl group? A

Question

6. (5 pts) Which of the following is not a characteristic of a carbonyl group? A. sp hybridized carbon atom B. planar geometry about the carbonyl bond C. carbonyl carbon atom is electrophilic D. carbonyl oxygen atom is nucleophilic E. weakly polarized carbon to oxygen bond F. All are characteristics of the carbonyl group 7. (5 pts) Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic substitution reactions? A. The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. B. Aldehydes are more sterically hindered than esters C. Once the nucleophile adds to an aldehyde, the tetrahedral intermediate is too sterically hindered to eliminate one of the attached groups. D. The ester carbonyl carbon is sp3 hybridized while the aldehyde carbonyl carbon is sp2 hybridized. since they are strongly basic.

Explanation / Answer

The answer for the given question is

6) E. Weakly polerized carbon to oxygen bond

7) The general structure of aldehyde is R-COH

and for eater is R-CO-OR

For aldehydes it is very difficult to substitute R and H.but for ester it is very easy to substitute -OR

So the answer is E

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