Chapter 7

Question 1

The triple bond in alkynes is a combination of ___ sigma bond formed by the overlap of __ hybrid orbitals and ___ pi bonds formed by the overlap of two sets of parallel __ orbitals.

Answer 1

one, sp, two, 2p

Question 2

The infix ___ is used to show the presence of a C-C triple bond.

Answer 2

-yn-

Question 3

We name the main chain:

Answer 3

as the longest one that contains the triple bond

Question 4

We assign numbers:

Answer 4

from the end that gives the carbon atoms of the triple bond the lower set of numbers

Question 5

If a hydrocarbon chain contains more than one triple bond, we use infixes:

Answer 5

-adiyn-, -atriyn-, and so forth

Question 6

Lower molecular weight alkynes are ____ at room temp.

Answer 6

gases

Question 7

Alkynes that are liquids at room temp. have densities less than:

Answer 7

1.0 g/mL

Question 8

Alkynes are _____ in water and other polar solvents.

Answer 8

insoluble

Question 9

Alkynes are ______ in nonpolar organic solvents.

Answer 9

soluble

Question 10

The pKa values of terminal alkynes are approx.:

Answer 10

25

Question 11

Alkynes are ____ acidic than alkenes and alkanes.

Answer 11

more