Most common amines (RNH2) exhibit pKa values between 35 and 45. R represents the rest of the compound (generally carbon and hydrogen atoms). However, when R is a cyano group, the pKa is found to be drastically lower: H H Incorrect. 人 R N H PK = 35-45 N N H PK = = 17 (a) Explain why the presence of the cyano group so drastically impacts the pKa. ○ When R is a cyano group, the acidic proton is on an sp-hybridized atom. ○ When R is a cyano group, the conjugate base is destabilized by resonance. ○ When R is a cyano group, the conjugate base is destabilized by inductive effects. ● When R is a cyano group, the conjugate base is stabilized by resonance.

Organic Chemistry
8th Edition
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Chapter3: Stereoisomerism And Chirality
Section3.8: The Significance Of Chirality In The Biological World
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Most common amines (RNH2) exhibit pKa values between 35 and 45. R represents the rest of the compound (generally carbon and
hydrogen atoms). However, when R is a cyano group, the pKa is found to be drastically lower:
H
H
Incorrect.
人
R N
H
PK = 35-45
N
N
H
PK =
= 17
(a) Explain why the presence of the cyano group so drastically impacts the pKa.
○ When R is a cyano group, the acidic proton is on an sp-hybridized atom.
○ When R is a cyano group, the conjugate base is destabilized by resonance.
○ When R is a cyano group, the conjugate base is destabilized by inductive effects.
● When R is a cyano group, the conjugate base is stabilized by resonance.
Transcribed Image Text:Most common amines (RNH2) exhibit pKa values between 35 and 45. R represents the rest of the compound (generally carbon and hydrogen atoms). However, when R is a cyano group, the pKa is found to be drastically lower: H H Incorrect. 人 R N H PK = 35-45 N N H PK = = 17 (a) Explain why the presence of the cyano group so drastically impacts the pKa. ○ When R is a cyano group, the acidic proton is on an sp-hybridized atom. ○ When R is a cyano group, the conjugate base is destabilized by resonance. ○ When R is a cyano group, the conjugate base is destabilized by inductive effects. ● When R is a cyano group, the conjugate base is stabilized by resonance.
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