Alkynes

Question 1

Alkynes

Answer 1

Hydrocarbon containing at least one triple bond
Aliphatic unsaturated hydrocarbon
sp hybridization (linear shape,180)

Question 2

Alkynes are _________ compound.

Answer 2

Aliphatic unsaturated hydrocarbon

Question 3

Hybridization,bond angle & shape of alkynes

Answer 3

sp hybridization
linear shape,180

Question 4

General formula of alkynes

Answer 4

CnH2N-2

Question 5

Bonds in alkynes

Answer 5

Triple bond
1 sigma & 2 pi bonds

Question 6

IUPAC nomenclature of alkyne

Answer 6

—yne

Question 7

Common nomenclature of alkyne

Answer 7

——acetylene

Question 8

Common name of ethyne

Answer 8

Acetylene

Question 9

Common name of 1-butyne

Answer 9

Ethylacetylene (Terminal alkyne)

Question 10

Common name of 2-pentyne

Answer 10

Ethylmethylacetylene (internal alkyne)

Question 11

Common name of 4-methyl 2-hexyne

Answer 11

sec-butylmethylacetylene (Second position mhr chain fil twr loh)

Question 12

Chemical properties of alkynes

Answer 12

Addition reactions
-Addition of hydrogen (hydrogenation)
-Addition of halogen (halogenation)
-Addition of hydrogen halides (Hydrohaligenation)
-Addition of water (Hydration)

Question 13

Catalyst of hydration of alkynes

Answer 13

H2SO4 (H & HSO4)

Question 14

Hydration of alkynes with terminal alkyne will produce

Answer 14

Aldehyde (CHO)

Question 15

Hydration of alkynes with internal alkyne will produce

Answer 15

Ketone (CO)

Question 16

Classification of alkynes

Answer 16

1)Primary alkynes
2)Secondary alkynes

Tertiary & quaternary structure are not possible in alkynes bcus of sp hybridization

Question 17

Primary alkynes

Answer 17

One gp is attached to triple bonded carbon

Question 18

Secondary alkynes

Answer 18

2 gp are attached to triple bonded carbon

Question 19

Physical properties of alkynes

Answer 19

1)Nonpolar
2)Insoluble in water
3)Soluble in organic solvent
4)Low bp

Question 20

State of alkynes

Answer 20

2-4>gases
4-8>liquid
above 8>solid

Question 21

Halogenation of alkynes

Question 22

Hydrohalogenation of alkyne