Alkenes

Question 1

other name of alkenes

Answer 1

olefins

Question 2

what does olefin mean?

Answer 2

oil forming

Question 3

What are monoene and diene?

Answer 3

Those having one double bond are called monoene and those having two two double bonds are called dienes.

Question 4

General formula of alkenes?

Answer 4

Cn H 2n - monoene

Question 5

Method of preparing alkenes from alkyl halides is called?
and what does it mean

Answer 5

dehydrohalogenation, removal of halogen along with hydrogen.

Question 6

Method of preparing alkenes from alkyl halides is called?
and what does it mean

Answer 6

dehydrohalogenation, removal of halogen along with hydrogen.

Question 7

Reagents and conditions for dehydrohalogenation?

Answer 7

Reagent:- alkyl halide + aqueous KOH
Condition : in the presence of alcoholic KOH

Question 8

dehydrohalogenation of 2-bromobutane and ethyl chloride?

Answer 8

rough work :>

Question 9

How alkenes are prepared from alcohols?

Answer 9

By dehydration, that is the removal of water.

Question 10

Best procedure for dehydration of alcohol?

Answer 10

Passing vapours of alcohol over heated alumina at a temperature of 340-450 degree celsius.

Question 11

What are primary, secondary and tertiary alcohols?

Answer 11

Primary - 2H with alpha carbon and 1 beta carbon.
Secondary- 1H with alpha carbon and 2 beta carbon.
Tertiary- no H with alpha carbon and 3 beta carbon.

Question 12

Conditions for primary, secondary and tertiary alcohols.

Answer 12

Primary - 75% H2SO4 and temp. of 140-170
Sec- 60% H2SO4 and temp. of 100
Ter- 20% H2SO4 and temp. of 85

Question 13

Produce alkenes from each of the alcohol.

Answer 13

Rough

Question 14

What are dehydrating agents?

Answer 14

They are used in removal of water like P4010, conc. H2SO4 and H3PO4.

Question 15

Ease of dehydration?

Answer 15

ter>sec>pri