Question 1

Which of the following best describes the role of NaOH in a reaction with an alkyl bromide (R-Br)?

Accepted Answer

NaOH acts as a nucleophile, attacking the carbon bonded to Br and replacing Br with OH.

Question 2

What type of reaction occurs when NaOH reacts with an alkyl bromide (R-Br) to form an alcohol (R-OH)?

Accepted Answer

Substitution

Question 3

In the reaction $$\mathrm{R{-}Br} + \mathrm{NaOH} \rightarrow \mathrm{R{-}OH} + \mathrm{NaBr}$$, which species is the leaving group?

Accepted Answer

$$\mathrm{Br^-}$$

Question 4

Which arrow-pushing mechanism correctly describes the substitution of Br by OH in the reaction of NaOH with an alkyl bromide?

Accepted Answer

A curved arrow from the lone pair on O in $$\mathrm{OH^-} to $$the carbon attached to Br, and another arrow from the C-Br bond to Br.

Question 5

Which of the following best describes the functional group transformation in the reaction $$\mathrm{R{-}Br} \xrightarrow{NaOH} \mathrm{R{-}OH}$$?

Accepted Answer

Haloalkane to alcohol

Question 6

Which of the following is the best description of a nucleophile in organic chemistry?

Accepted Answer

An electron-rich species that donates a pair of electrons to an electrophile.

Question 7

Which of the following statements about leaving groups is correct?

Accepted Answer

A good leaving group is a weak base and can stabilize a negative charge.

Question 8

Which of the following is the correct order of acid strength (from strongest to weakest) based on pKa values: HCl (pKa = -7), phenol (pKa = 10), water (pKa = 14)?

Accepted Answer

HCl \u003e phenol \u003e water

Question 9

Which of the following factors does NOT increase the acidity of a compound?

Accepted Answer

Decreasing resonance stabilization in the conjugate base

Question 10

Which of the following best describes the role of Brønsted-Lowry acids and bases in organic reactions?

Accepted Answer

Acids donate protons (H$$^+$$), bases accept protons (H$$^+)$$

Question 11

Which of the following is a Lewis acid?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 12

Which of the following functional groups is present in the molecule shown in the image (structure with OH, O, and N atoms on a polycyclic ring)?

Accepted Answer

Alcohol, ketone, and amine

Question 13

Which of the following best describes the effect of increasing s-character in the hybridization of a carbon atom on the acidity of a hydrogen attached to it?

Accepted Answer

Increases acidity due to greater stability of the conjugate base

Question 14

Which of the following is the correct curved arrow notation for the nucleophilic substitution reaction between $$\mathrm{OH^-}$$ and $$\mathrm{CH_3Br}$$?

Accepted Answer

Arrow from the lone pair on O in $$\mathrm{OH^-} to $$the C in $$\mathrm{CH_3Br}$$, and arrow from C-Br bond to Br.

Question 15

Which of the following best describes the effect of an electron-withdrawing group (such as Cl) on the acidity of a carboxylic acid?

Accepted Answer

Increases acidity by stabilizing the conjugate base through inductive effects

Question 16

Which of the following is the correct relationship between Ka and pKa?

Accepted Answer

$$pK_a = -\log_{10} K_a$$

Question 17

Which of the following is a correct statement about resonance and acid strength?

Accepted Answer

More resonance structures in the conjugate base increase acid strength.

Question 18

Which of the following is the best description of an electrophile?

Accepted Answer

An electron-poor species that accepts a pair of electrons from a nucleophile.

Question 19

Which of the following is the correct classification for the reaction: $$\mathrm{CH_3CH_2Br} + \mathrm{NaOH} \rightarrow \mathrm{CH_3CH_2OH} + \mathrm{NaBr}$$?

Accepted Answer

Substitution

Core Concepts in Organic Reaction Mechanisms and Functional Groups

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