$$[2 \times 4 + 2 - 6] / 2 = 2$$

Question 1

Which of the following best describes a radical reaction mechanism in organic chemistry?

Accepted Answer

Unpaired electrons are transferred using single-headed arrows, and the mechanism consists of initiation, propagation, and termination steps.

Question 2

In the radical halogenation of alkanes, which carbon is most likely to be substituted first when using $$Br_2$$ and light?

Accepted Answer

The most substituted carbon.

Question 3

Which statement about polar reactions is correct?

Accepted Answer

They are the dominant mechanism in organic chemistry and involve electron pairs moving to generate charged compounds.

Question 4

Given the reaction $$CH_3CH_2Br + KOH \rightarrow CH_2$=CH_2$ + KBr + H_2O$$, what type of reaction is this?

Accepted Answer

Elimination

Question 5

Which of the following is true regarding the use of arrows in reaction mechanisms?

Accepted Answer

Double-headed arrows represent movement of electron pairs from nucleophile to electrophile.

Question 6

Calculate the degree of unsaturation for $$C_4H_6.$$

Accepted Answer

$$[2 	imes 4 + 2 - 6] / 2 = 2$$

Question 7

Which of the following statements about alkene geometry is correct?

Accepted Answer

Cis and trans isomers of alkenes are stereoisomers that cannot interconvert under normal conditions.

Question 8

According to Markovnikov's rule, in the addition of $$HBr to $$propene, where does the bromine atom add?

Accepted Answer

To the more substituted carbon of the double bond.

Question 9

Which factor most strongly influences the stability of a carbocation intermediate?

Accepted Answer

The degree of alkyl substitution and resonance stabilization.

Question 10

What is the product of the reaction: $$CH_2$$=$$CH_2$$ + $$Br_2$$ \rightarrow$$ ?

Accepted Answer

$$CH_2Br-CH_2Br$$

Question 11

Which reagent and conditions would result in anti-Markovnikov addition of $$HBr to an $$alkene?

Accepted Answer

$$HBr in $$the presence of $$ROOR ($$peroxides) and heat

Question 12

Which of the following best explains why halogenation of alkenes with $$Br_2$$ produces only trans products?

Accepted Answer

The formation of a bromonium ion intermediate blocks one face, forcing attack from the opposite side.

Question 13

Which of the following is true about the hydration of alkenes using $$BH_3$$, $$THF$$, followed by $$H_2O_2$$, $$NaOH$$?

Accepted Answer

The reaction gives anti-Markovnikov addition and syn stereochemistry.

Question 14

Which of the following is a correct statement about oxidation and reduction in organic chemistry?

Accepted Answer

Oxidation involves forming C-O, C-X, or C-N bonds and breaking C-H bonds.

Question 15

What is the expected product when $$CH_2$$=$$CH_2 is $$treated with $$mCPBA$$?

Accepted Answer

An epoxide: $$CH_2OCH_2$$

Question 16

Which of the following statements about reaction coordinate diagrams is correct?

Accepted Answer

The transition state is an energetic local maximum along the reaction pathway.

Question 17

Which of the following is true about the E/Z nomenclature for alkenes?

Accepted Answer

Z is assigned when the highest priority groups are on the same side of the double bond.

Question 18

Which of the following reactions is classified as a rearrangement?

Accepted Answer

$$A-B-C \xrightarrow{\Delta} B-C-A$$

Question 19

Which of the following is a correct statement about nucleophiles and electrophiles?

Accepted Answer

Nucleophiles have electrons to share and arrows start from them in mechanisms.

Introduction to Organic Reactions: Types, Mechanisms, and Key Concepts

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