Alcohols, Phenols & Ethers

Question 1

Catechol and Resorcinol are which type of isomers?

Answer 1

Position isomers (dihydric; two OH groups attached to benzene ring)

Question 2

Lucas reagent is?

Answer 2

Conc. Hcl and ZnCl2

Question 3

The C-OH bond angle in alcohols is

Answer 3

108.5 (slightly higher than water)

Question 4

Methyl alcohol pka?

Answer 4

15.5

Question 5

Ethyl alcohol pka?

Answer 5

15.9

Question 6

Sec-propyl alcohol pka?

Answer 6

16.3

Question 7

Ter-butyl alcohol pka?

Answer 7

17

Question 8

Which reagent used when SOCl2 reacts with alcohol?

Answer 8

Pyridine

Question 9

Alcohol with concentrated h2so4 at higher temperature 170 C gives

Answer 9

Alkenes (dehydration)

Question 10

Bond angle in ether

Answer 10

110.5

Question 11

Alcohol with conc h2so4 at lower temperature 140 C forms

Answer 11

Ethers by dehydration

Question 12

Which two ethers exist as gases at room temp?

Answer 12

Dimethyl ether and ethyl methyl ether

Question 13

Which ether used as solvent in wurtz and grignard reactions

Answer 13

Diethyl ether

Question 14

Why are ethers less reactive

Answer 14

Due to the stability of C-O bond

Question 15

Ethers are chemically

Answer 15

Weak bases due to lone pairs of o atom

Question 16

Ethers react with strong acids to form

Answer 16

Oxonium salts

Question 17

Oxonium salts of ethers are stable if

Answer 17

Acid is concentrated

Question 18

Oxonium salts upon dilution with water form

Answer 18

Acid and ether

Question 19

Water is stronger ______ than ether

Answer 19

Lewis acid

Question 20

Catechol?

Answer 20

1,2

Question 21

Resorcinol

Answer 21

1,3

Question 22

Hydroquinone

Answer 22

1,4

Question 23

Pyragallol

Answer 23

1,2,3

Question 24

Geometry of phenol?

Answer 24

Bent and slightly distorted than a regular tetrahedron

Question 25

Physical state of phenol?

Answer 25

White crystalline solid

Question 26

Phenol may appear which colour due to presence of impurities

Answer 26

Red

Question 27

Nature of phenol?

Answer 27

Toxic and corrosive

Question 28

In Dow's process, phenol is prepared from

Answer 28

Chlorobenzene using NaOH at 350 and 150 atm

Question 29

In sulphonation of phenol reagent and temp?

Answer 29

Na2SO3 at 350 C

Question 30

Picnic acid is

Answer 30

Trinitrophenol

Question 31

Oxidation of phenol produced

Answer 31

Yellow coloured conjugated diketone called benzoquinone