Alcohols

Question 1

Alcohol

Answer 1

Hydrocarbon containing hydroxyl (-OH) functional gp

Question 2

Functional gp of alcohol

Answer 2

-OH

Question 3

General formula of alcohol

Answer 3

CnH2n+1OH

Question 4

CH3CH2CH2CH2OH

Answer 4

1-butanol
n-butanol
Primary butanol

Question 5

CH3CH2CHCH3
OH

Answer 5

2-butanol
Secondary butanol

Question 6

CH3CHCH2OH
CH3

Answer 6

2-methyl 1-propanol
Isobutanol

Question 7

CH3
CH3COH
CH3

Answer 7

2-methyl 2-propanol
Tertiary propanol

Question 8

Phenol

Answer 8

Phenyl alcohol (C6H5OH)
OH gp always C1 is connected to a benzene ring

Question 9

Classification of alcohol

Answer 9

1)Primary alcohol
2)Secondary alcohol
3)Tertiary alcohol

Question 10

Primary alcohol

Answer 10

One gp is attached to carbon next to OH

Question 11

Secondary alcohol

Answer 11

2 gp attached to carbon next to OH

Question 12

Tertiary alcohol

Answer 12

3 gp attached to carbon next to OH

Question 13

Physical properties of alcohol

Answer 13

1)Higher boiling point than alkanes and alkyl halides
2)Good solubility in water (esp lower alcohol)

*bcus of Hydrogen bonding in O-H
H bond is strong & polar

Question 14

Alcohol are stronger than alkanes.Why?

Answer 14

Bcus it contains hydrogen which are stronger than London dispersion forces

Question 15

Alcohol are______ & soluble in ______.

Answer 15

Polr & soluble in water
bcus of OH gp

Question 16

Chemical reaction of alcohols

Answer 16

1)Oxidation
2)Dehydration
3)Esterification

Question 17

Oxidation reaction of alcohol

Answer 17

Catalyst-K2Cr2O7 (acid solution)
Primary alcohol-oxidzed into aldehyde
Secondary alcohol-oxidized into ketone
Tertiary alcohol-cannot undergoes oxidation

Question 18

Oxidation of primary alcohol

Answer 18

Addition of nascent oxygen and produce ALDEHYDE
Aldehyde can further oxidised into carboxylic acid
K2Cr2O7(Orange)>Green solution

Question 19

Oxidation of secondary alcohol

Answer 19

Addition of nascent oxygen and produce KETONE
K2Cr2O7(Orange)>Green solution

Question 20

Oxidation of tertiary alcohol

Answer 20

No reaction
No color change in K2Cr2O7 solution

Question 21

Dehydration reaction of alcohol

Answer 21

Removal of water
Catalyst-Conc:H2SO4 & heat
Excess alcohol at 140—–Ether
Excess H2SO4 at <180——Alkene

Question 22

Dehydration of alcohol with excess alcohol

Answer 22

Reaction occur at 140 degree
Catalyst-H2SO4
Product-Ether

Question 23

Dehydration of alcohol with excess H2SO4

Answer 23

Reaction at 180 degree
Catalyst-H2SO4
Product-Alkene

Question 24

Esterification reaction of alcohol

Answer 24

caboxylic acid+alcohol—–>ester
Catalyst-conc:H2SO4

eg.CH3COOH+CH3CH2OH——->CH3COOCH2CH3+H2O

Question 25

Boiling point of alcohol is increased as _______ & decreased as ________.

Answer 25

Increase bp as increasing weight(more OH) Decrease bp by increasing more R gp eg.propanol

Question 26

Are phenol alcohol?

Answer 26

No Phenol is not alcohol,a weak acid

Question 27

Chemical properties of bases

Answer 27

1)Neutrilization 2)Ionization in water

Question 28

Neutrilization of phenol with bases

Question 29

Ionization of phenol in water