Alcohol, Phenol, Ether and Ethoxides

Question 1

Relation between acidic strength and EWG/EDG.

Answer 1

EWG increases and EDG decreases acidic strength.

Question 2

Oxidations series: Of Alcohols

Answer 2

Hydrocarbons→ Alcohol→ Aldehyde/Ketone → Carboxylic acids→ CO2

Question 3

Name few mild oxidizing agents

Answer 3

1. PCC
2. PDC
3. Collins reagent
4. Cu and 573 K

Question 4

Strong Oxidizing agents

Answer 4

1. Aqueous soln. of hot Alkaline KMnO4
2. Acidified K2Cr2O7 or NaCr2O7
3. Jones reagent
4. Chromic Acid

Question 5

Jones Reagent

Answer 5

CrO3, conc. aq. H2SO4, Acetone

Question 6

Chromic Acid

Answer 6

H2CrO4

Question 7

3° ROH reacting with Cu with heat gives

Answer 7

Alkene

Question 8

1° and 2° ROH reacting with Cu with heat gives

Answer 8

Oxidized product

Question 9

Baeyer’s reagent is

Answer 9

cold dilute aqueous solution of 1% alkaline KMnO4.

Question 10

Ways of preparation of alcohols from alkene are

Answer 10

a. By acid catalyzed hydration
b. Oxymercuration - Demercuration
c. Hydroboration - Oxidation of alkenes
d. By action of Baeyer’s reagent / syn dihydroxylation/ Baeyer’s test
e. Using peroxides/ Anti dihydroxylation

Question 11

What is different in Baeyer’s test?

Answer 11

It ‘forms diols’ through syn addition.

Question 12

What reagent can be used to form diols other than Baeyer’s reagent?

Answer 12

1). OsO4 —> 2). NaHSO3/ H2O⁺

Question 13

Which one is anti in formation of alcohols from alkenes?

Answer 13

Peroxides usage / anti dihydroxylation

Question 14

How peroxides make a difference?

Answer 14

They form diols through anti addition.

Question 15

Several Peroxides used are

Answer 15

1. Peracetic acid
2. Trifluoroperacetic acid
3. meta - chloroperoxybenzenoic acid

Question 16

Order towards Grignard Reagent is

Answer 16

Acid chlorides > Aldehydes > Ketones > Esters

Question 17

Reducing agents of aldehydes/ketones to form alcohols are -

Answer 17

H2/Ni or Pd/Pt; LiAlH₄ ; NaBH₄