Question 1

Which of the following terms comes closest to describing an electrophile?

Accepted Answer

An electrophile is a molecule or ion that accepts an electron pair to form a chemical bond. Lewis acids, which are defined as electron pair acceptors, are the molecules that come closest to describing an electrophile.

Question 2

Use the curved arrow formalism to indicate the movement of electron pairs in the following reaction.

Accepted Answer

The answer of Use the curved arrow formalism to indicate...

Question 3

Use the curved arrow formalism to show the movement of electron pairs in the following reaction.

Accepted Answer

The answer of Use the curved arrow formalism to show...

Question 4

The hydroxide ion (HO^-) cannot function well as which of the following?

Accepted Answer

The hydroxide ion has a lone pair of electrons and can easily donate them to a proton, making it a strong Bronsted-Lowry base and Lewis base. It can also act as a nucleophile, as it has a negative charge and can attack positively charged species. However, as it already has a full octet of electrons, it cannot accept another electron pair, making it incapable of acting as an electron-pair acceptor. Therefore, the best choice is D.

Question 5

In the reaction below, label each reactant as a nucleophile or an electrophile.

Accepted Answer

The answer of In the reaction below, label each reactant...

Question 6

In the reaction below, label each reactant as a nucleophile or an electrophile. CH₃COO^- + O₂S(OCH₃)₂ → CH₃COOCH₃ + CH₃SO₄^-

Accepted Answer

The answer of In the reaction below, label each reactant...

Question 7

According to the Lewis definition, which of the following may act as acids?

Accepted Answer

According to the Lewis definition, an acid is a substance that can accept a pair of electrons. All the given options, including ammonia (NH₃, which seems to be a typographical error for NH3), HCl, and AlCl₃ (presumably meant to be AlCl3), can act as Lewis acids. NH3 can act as a Lewis base but in certain contexts, it can accept an electron pair, making it a Lewis acid. HCl can donate a proton (H+) and accept an electron pair in the process, and AlCl3 can accept an electron pair due to the empty orbitals of aluminum.

Quiz 1: Introduction and Review