Question 1

Calculate the degrees of unsaturation for a compound with the molecular formula $$\mathrm{C$$_{47}$$H_{51}NO$$_{14}}$. Which formula should you use?

Accepted Answer

Degrees of unsaturation $$= \frac{2C + 2 + N - H - X}{2}$$

Question 2

What is the correct IUPAC name for the compound shown in $$image_1$$?

Accepted Answer

4-ethyl-2-methyl-3-hexene

Question 3

Which compound from the images is named (2E,4E)-1-chloro-3-methyl-2,4-hexadiene?

Accepted Answer

Compound in $$image_5$$

Question 4

In the reaction shown in $$image_13$$, what is the role of $$\mathrm{HBr}$$?

Accepted Answer

$$\mathrm{HBr}$$ acts as an electrophile, providing $$\mathrm{H^+}$$ for the alkene to attack.

Question 5

How many transition states are present in the reaction coordinate diagram shown in $$image_16$$?

Accepted Answer

3 transition states

Question 6

For an exergonic reaction forming two intermediates, what is the sign of the overall change in free energy ($$\Delta G$$)?

Accepted Answer

Negative

Question 7

Which compound is named 4-isopropyl-1-methylcyclohexene?

Accepted Answer

Compound in $$image_2$$

Question 8

What is the product of the reaction shown in $$image_14$$, where an alkene reacts with $$\mathrm{HBr}$$?

Accepted Answer

2-bromo-2-methylbutane

Question 9

Which compound is named (2Z,4E)-3-ethyl-2,4-hexadiene?

Accepted Answer

Compound in $$image_1 ($$with correct stereochemistry)

Question 10

In the reaction shown in $$image_15$$, what is the product when cyclohexene reacts with $$\mathrm{HBr}$$ and water?

Accepted Answer

Cyclohexene is regenerated, and $$\mathrm{OH_3$^+}$$ and $$\mathrm{Br^-}$$ are formed.

Question 11

Which of the following best describes the movement of electrons in the SN2 reaction shown in $$image_16$$?

Accepted Answer

The nucleophile attacks the carbon, displacing the leaving group in a single step.

Question 12

Rank the following alkenes in order of increasing heat of hydrogenation: $$image_7$$, $$image_8$$, $$image_9$$, $$image_10$$, $$image_11.$$

Accepted Answer

$$image_10$$, $$image_7$$, $$image_9$$, $$image_8$$, $$image_11$$

Question 13

Which compound is named 4-ethyl-3-methylcyclohexene?

Accepted Answer

Compound in $$image_4$$

Question 14

What is the major product when 2-methyl-2-butene reacts with $$\mathrm{HBr}$$?

Accepted Answer

2-bromo-2-methylbutane

Question 15

Which compound is named 4-ethyl-2-methyl-3-hexene?

Accepted Answer

Compound in $$image_3$$

Question 16

In the reaction coordinate diagram shown in $$image_16$$, what do the peaks represent?

Accepted Answer

Transition states

Question 17

Which compound is named 2-bromo-2-methylbutane?

Accepted Answer

Compound in $$image_6$$

Question 18

What is the product of the SN2 reaction shown in $$image_16$$, where 2-bromo-2-methylbutane reacts with hydroxide?

Accepted Answer

2-methyl-2-butanol

Question 19

Which compound is named 2-methyl-2-butene?

Accepted Answer

Compound in $$image_7$$

Step-by-Step Guidance for Naming Organic Compounds (Alkenes and Cycloalkenes)

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