Author Question: In the mechanism for acid catalyzed hemiacetal formation, the first step is: A) protonation of the ... (Read 80 times)

brutforce · **on:** Aug 23, 2018

In the mechanism for acid catalyzed hemiacetal formation, the first step is:
A)
protonation of the carbonyl oxygen
B)
nucleophilic attack at the carbonyl carbon
C)
protonation of the oxygen of the alcohol
D)
nucleophilic attack at the carbon of the alcohol
E)
elimination of a water molecule

Question 2

Which hydrogens in the following compound will be exchanged most rapidly for deuterium upon reaction with D₂O and NaOD?

A)
H₁
B)
H₂
C)
H₃
D)
H₄
E)
H₅

Question 3

The enol tautomer of 3-pentanone is:
A)

D)

B)

E)

C)

Question 4

The predominant product from the reaction below is:

A)

D)

B)

E)

C)

Question 5

The number of a-hydrogens in

is:
A)
1
B)
3
C)
4
D)
8
E)
14

Question 6

The equilibrium that exists between the keto and enol forms of aldehydes and ketones is known as:
A)
stereoisomerism
B)
configurational isomerism
C)
geometric isomerism
D)
tautomerism
E)
positional isomerism

nickk12214 · **Reply #1 on:** Aug 23, 2018

Answer to Question 1

a

Answer to Question 2

c

Answer to Question 3

d

Answer to Question 4

c

Answer to Question 5

c

Answer to Question 6

d