Question 1

Which property of boranes primarily drives their chemical reactions?

Accepted Answer

High electron deficiency

Question 2

When diborane ($\mathrm{B_2H_6}$) reacts with water, which of the following products is formed?

Accepted Answer

Boric acid and hydrogen gas

Question 3

Given the reaction: $\mathrm{B_2H_6 + 6H_2O \rightarrow 2B(OH)_3 + 6H_2}$, what is the role of water in this reaction?

Accepted Answer

Reactant providing protons

Question 4

If 110 kJ of energy is released per mole of diborane reacting with water, how much energy is released when 100.0 g of diborane is completely reacted?

Accepted Answer

$346$ kJ

Question 5

In Lewis acid-base reactions involving borane ($\mathrm{BH_3}$), which statement is correct?

Accepted Answer

Borane acts as a Lewis acid by accepting electrons

Question 6

What is the adduct product formed when borane ($\mathrm{BH_3}$) reacts with a hydroxide ion ($\mathrm{OH^-}$)?

Accepted Answer

$\mathrm{BH_3OH}$

Question 7

Which of the following best describes the electron flow in the reaction between borane and a Lewis base?

Accepted Answer

Electrons flow from the Lewis base to borane

Question 8

A student mixes diborane with excess water. Which gas is evolved during the reaction?

Accepted Answer

Hydrogen

Question 9

Which of the following is a correct balanced equation for the reaction of diborane with water?

Accepted Answer

$\mathrm{B_2H_6 + 6H_2O \rightarrow 2B(OH)_3 + 6H_2}$

Question 10

Which statement best explains why diborane reacts vigorously with water?

Accepted Answer

Diborane is highly electron-deficient and seeks electron-rich species

Question 11

In the context of Lewis acid-base theory, which species acts as the electron pair donor in the reaction between borane and hydroxide ion?

Accepted Answer

Hydroxide ion ($\mathrm{OH^-}$)

Question 12

If 1.00 mol of diborane reacts with excess water, how many moles of hydrogen gas are produced?

Accepted Answer

$6.00$ mol

Question 13

Which of the following is NOT a product of the reaction between diborane and water?

Accepted Answer

Methane

Question 14

A chemist wants to maximize hydrogen production using diborane and water. Which factor should be increased?

Accepted Answer

Amount of diborane

Question 15

Which of the following best describes the role of diborane in a Lewis acid-base reaction?

Accepted Answer

Lewis acid

Question 16

In a reaction where diborane is mixed with water, what is the oxidation state of boron in the product boric acid?

Accepted Answer

$+3$

Question 17

Which of the following reactions demonstrates a Lewis acid-base interaction?

Accepted Answer

$\mathrm{BH_3 + OH^- \rightarrow BH_3OH}$

Question 18

Which statement is true regarding the products of diborane hydrolysis?

Accepted Answer

Hydrogen gas is produced as a byproduct

Question 19

A student claims that borane is a Lewis base. Which evidence from its reactions contradicts this claim?

Accepted Answer

Borane accepts electron pairs from bases

Question 20

Which of the following best explains why diborane is considered highly reactive?

Accepted Answer

It has a high electron deficiency

Borane Reactions: Mechanisms and Acid-Base Behavior

Study Guide - Practice Questions