Exam 3

Question 1

Compounds containing both double and triple bonds are called

Answer 1

-enynes

Question 2

When naming a compound that has both an alkene and alkyne, which one takes priority

Answer 2

Alkene

Ex)1-nonen-8-yne
1=Alkene on first carbon

Question 3

What is the exception for an alkyne being a higher priority over Alkene

Answer 3

If a lower number can be assigned to the alkyne instead of the Alkene then the alkyne take priority

Question 4

What is the exception if the Alkene and alkyne are equidistant

Answer 4

The whichever one is closest to the substituent is higher priority

Question 5

CH3CH2CH2CH2

Answer 5

Butyl

Question 6

1-Butenyl

Answer 6

CH3CH2CH=CH

Question 7

1-Butynyl

Answer 7

CH3CH2C-=C
(Triple bond)

Question 8

Vic in Al dihalides are prepared by

Answer 8

Addition of X2 to an Alkene

Add one H and a Hlogen to each carbon connected to the Alkene

Final product= alkane

Question 9

How to prepare an alkyne (typically from alkane)

Answer 9

Strong base reagents: KOH or NaNH2

Question 10

For halgenation: 1eq of X2 will produce

Answer 10

A trans Alkene

Question 11

Halogenating reagents

Answer 11

Cl2 or Br2

CH3CO2H

Question 12

Reagents for acid catalyzed Hydration

Answer 12

1. HgSO4
2. H2SO4, H2O

Produces. Ketone

Question 13

Heats of hydrogenation shows

Answer 13

First step of this reaction is more exothermic than the second step

Question 14

-176 kj/mol vs -137kj/Mol which is more exothermic

Answer 14

-176kj/mol

Question 15

Describe connect break off method

Answer 15

A method for terminal alkynes to make a hydrocarbon
(Slide 1 of 9.2 slides)

Question 16

Relationship between terminal alkynes and alkenes/alkanes

Answer 16

Terminal alkynes are more acidic than alkenes or alkanes

Question 17

Which base should I choose to create sodium acetylene: NaOH or NaNH2

Explain why

Answer 17

For deprotanation of an terminal alkyne we need the strongest base out of the two. NaNH2 is the strongest bc it has a stronger conjugate acid than NaOH

Question 18

SN1 step 1 reaction

Answer 18

Leaving group leaves and carbocation is formed

Question 19

For an inversion SN2 reaction what carbon changes it’s stereochemistry

Answer 19

The carbon bearing the leaving group is invented, meaning it changes stereochemistry

Question 20

For an SN2 reaction has a strong nucleophile it’s attacks from

Answer 20

The back and inversion of stereochemistry occurs