Chapter 3 - Alkenes and Alkynes

Question 1

What type of hydrocarbons are alkenes and alkynes?

Answer 1

Unsaturated

Question 2

General formula for alkenes

Answer 2

CnH2n

Question 3

General formula for alkynes

Answer 3

CnH2n-2

Question 4

General formula for saturated hydrocarbon

Answer 4

CnH2n+2

Question 5

Alkadienes that are separated by one C-C single bond

Answer 5

Conjugated

Question 6

Alkadienes that are separated by more than one C-C single bond)

Answer 6

Nonconjugated

Question 7

True or False:

carbon–carbon double bonds are longer than carbon–carbon single bonds

Answer 7

False
(Shorter)

Question 8

bond is formed from the end-on overlap of two orbitals

Answer 8

Sigma

Question 9

bond is formed by lateral overlap of p orbitals on adjacent atoms

Answer 9

Pi

Question 10

Reaction that is common for alkanes

Answer 10

Substitution

Question 11

Reaction common for alkenes

Answer 11

Alkenes

Question 12

True or False:

sigma bonds are usually stronger than pi bonds

Answer 12

True

Question 13

Test for unsaturation

Answer 13

Bromine test

Question 14

Water adds as H-OH in hydration and the products are what?

Answer 14

Alcohols

Question 15

It gives only one of the two possible regioisomers

Answer 15

Regiospecific

Question 16

It produces mainly one regioisomer

Answer 16

Regioselective

Question 17

The only product for regiospecific

Answer 17

2-propanol

Question 18

electron-poor reactants; they seek electrons.

Answer 18

Electrophiles

Question 19

electron-rich reactants; they form bonds by donating electrons to electrophiles.

Answer 19

Nucleophiles

Question 20

act as a supplier of pi electrons to an electron-seeking reagent

Answer 20

Double bond

Question 21

A positively charged carbon atom bonded to three other atoms

Answer 21

Carbocation

Question 22

What rule is this?

The electrophilic addition of an unsymmetric reagent to an unsymmetric double bond proceeds in such a way as to involve the most stable carbocation.

Answer 22

Markovnikov’s rule

Question 23

It shows the changes in energy that occur in the course of a reaction

Answer 23

Reaction energy diagram

Question 24

A structure with maximum energy for a particular reaction step

Answer 24

Transition state

Question 25

It is the difference in energy between reactants and the transition state and determines the reaction rate.

Answer 25

Activation energy

Question 26

True or False:

Higher the energy barrier, the faster the reaction

Answer 26

False
(Higher the energy barrier, the slower the reaction)

Question 27

Addition of H-B to an alkene

Answer 27

Hydroboration

Question 28

Addition of hydrogen to alkenes in the presence of a catalyst

Answer 28

Hydrogenation

Question 29

Carbocation with a carbon–carbon double bond that is adjacent to the positively charged carbon atom

Answer 29

Allylic cation

Question 30

the cycloaddition reaction of a conjugated diene and a dienophile to give a cyclic product in which three  bonds are converted to two  bonds and a new  bond.

Answer 30

Diels-Alder reaction

Question 31

True or False:

Alkenes react rapidly and quantitatively with ozone

Answer 31

True

Question 32

It can be used to locate the position of a double bond.

Answer 32

Ozonolysis

Question 33

Angle betweem teo sp orbitals of a triple bond

Answer 33

180 degrees

Question 34

True or False

hydrogen atom on a triply bonded carbon is weakly basic

Answer 34

False
(Weakly acidic)

Question 35

The process of polymer formation

Answer 35

Polymerization