Organic Chemistry (8th Edition)

Published by Pearson
ISBN 10: 0321768418
ISBN 13: 978-0-32176-841-4

Chapter 1 - Introduction and Review - Study Problems - Page 41: 1-51 b

Answer

The order of stability is shown in the attached image.
1523369222

Work Step by Step

The stability of the conjugate base depends on if it is charged or not, and if it is charged, the positive charge should not be on a highly electronegative element. With these considerations, we see that : $NH_3$ is the most stable conjugate base because it is neutral, and the polarity of $N-H$ bonds is lesser than that of the $O-H$ bonds in $H_2O$, which is the next most stable base. This is because the electronegativity of nitrogen is less than oxygen. Then, the further order of stability decreases as the positive charge is first on nitrogen (electronegative) and then on oxygen (more electronegative than oxygen). Out of the last two compounds, the former is resonance stabilised. Hence, the order of stability is as depicted in the image.
Small 1523369222
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.