Which of the following reagents is best suited for the oxidation of primary alco

Question

Which of the following reagents is best suited for the oxidation of primary alcohols to aldehydes? A. CrO_3 B. Pyridine + CrO_3 + HCI (1:1:1) C. KMnO_4 D. K_2Cr_2O_7 + H_2SO_4 Arrange the following compounds in the order of their acidity. A. 1 >2 > 3 > 4 B. 4 > 3 > 2 > 1 C. 2 > 1 > 3 > 4 D. 2 > 1 > 4 > 3 What type of isomers are the following two compounds? 0? A. Constitutional isomers B. Enantiomers C. Diastereomers D. Tautomers What is the major product of the following reaction?

Explanation / Answer

For primary alcohols, it is much better to avoid strong oxidants such as:

Chromates: CrO3, Cr2O7 and manganates MnO4,

the best option is pyridine and CrO3 which is gentle, but still will convert the alcohol to aldehyde, and will not ocnvert it to carboxilic acid (i.e. oxidieze the H from C-OH)

21

acidity --> how easy they donate H+ ions

The storngest acid, due to C=O and =OH group, must be 2

then comes the alochol, -OH which is stronger than the amine + alkene

then comes the amine, even though it is a base, it can still donate its H+ ion, it will donate it easier than the alkene

The alkene is not likely to donate its H+ and requires a lot of energy to do that

sop

2 > 1 > 3 > 4

Q22.

this is tautomerism, since the H is changinf form places

Q23

the alkene will attach to OH- from water... so B and D can't be

choose C

since the methyl in A is not likely to form

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