Chapter 9.3, Problem 5PTS

(a)

Interpretation Introduction

Interpretation:

The deprotonation of given terminal alkyne can be done or not by given base has to be determined.

Concept Introduction:

Acidity of terminal alkynes:

Acidity of alkynes depends on $\text{pKa}$ of it.  Increase in $\text{pKa}$ value, decreases acidity of alkynes and vice-versa.  During deprotonation of alkynes, if the base added is stronger than it results in formation of weaker base and favors the equilibrium.  But the added base produces stronger base, then the acid is weaker acid.

(b)

Interpretation Introduction

Interpretation:

The deprotonation of given terminal alkyne can be done or not by given base has to be determined.

Concept Introduction:

Acidity of terminal alkynes:

Acidity of alkynes depends on $\text{pKa}$ of it.  Increase in $\text{pKa}$ value, decreases acidity of alkynes and vice-versa.  During deprotonation of alkynes, if the base added is stronger than it results in formation of weaker base and favors the equilibrium.  But the added base produces stronger base, then the acid is weaker acid.

(c)

Interpretation Introduction

Interpretation:

The deprotonation of given terminal alkyne can be done or not by given base has to be determined.

Concept Introduction:

Acidity of terminal alkynes:

Acidity of alkynes depends on $\text{pKa}$ of it.  Increase in $\text{pKa}$ value, decreases acidity of alkynes and vice-versa.  During deprotonation of alkynes, if the base added is stronger than it results in formation of weaker base and favors the equilibrium.  But the added base produces stronger base, then the acid is weaker acid.