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Exam 11: Alkynes

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Question 1

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Which of the following statements about alkynes is not true?

A) Alkynes undergo many addition reactions.
B) Alkynes are more polarizable than alkenes.
C) Both  bonds of a C-C triple bond are weaker than a C-C  bond.
D) The electrons in the  bonds of alkynes are more tightly held than those of alkenes.

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Question 2

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In the addition of HBr to 1-butyne, the electrophile in the first step of the mechanism is:

A) The Csp-H1s bond of 1-butyne.
B) The C-C triple bond of 1-butyne.
C) The H atom in HBr.
D) The Br ion.

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Question 3

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Give the IUPAC name for the following compound.

In the addition of HBr to 1-butyne, the nucleophile in the first step of the mechanism is:

Which of the following molecular formulas is consistent with the formula for a molecule containing one alkyne and no other degrees of unsaturation? $\begin{array} { c c c l } \mathrm { C } _ { 10 } \mathrm { H } _ { 20 } & \mathrm { C } _ { 10 } \mathrm { H } _ { 22 } & \mathrm { C } _ { 10 } \mathrm { H } _ { 18 } & \mathrm { C } _ { 10 } \mathrm { H } _ { 19 } \\\text { I } & \text { II } & \text { III } & \text { IV }\end{array}$

Which of the following represents an internal alkyne?

How many degrees of unsaturation are introduced by a triple bond?

Which method would work the best in accomplishing the following transformation?

Give the IUPAC name for the following compound.

Which of the following compounds is a tautomer of 2-hexanone?

Which of the following bases can deprotonate acetylene? You are given the pK_a values of the conjugate acids in parentheses. $\mathrm { CH } _ { 3 } \mathrm { NH } ^ { - } \left( \mathrm { p } K _ { a } = 40 \right) \quad \mathrm { CO } _ { 3 } ^ { 2 - } \left( \mathrm { p } K _ { a } = 10.2 \right) \quad \mathrm { CH } _ { 2 } = \mathrm { CH } ^ { - } \left( \mathrm { p } K _ { a } = 44 \right) \quad \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CO } ^ { - } \left( \mathrm { p } K _ { a } = 18 \right)$ I $\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$ II $\quad\quad\quad\quad\quad\quad\quad\quad\quad$ III $\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$ IV

What is the major product of the following reaction?

Which of the following alkynes is a symmetrical alkyne?

Which of the following represents a terminal alkyne?

How many  bonds and  bonds are present in a triple bond?

Which of the indicated hydrogen in the following compounds is the least acidic?

What is the major organic product of the following reaction?

What is the major organic product of the following reaction?

Which of the following anions is the most basic?

Which of the following statements about tautomers is true?