1.

Which of the following compounds is an unsaturated hydrocarbon?

methane
*propyne
nonane
methyl

2.
The general name for hydrocarbons with at least one triple covalent bond is ____.

alkenes
alkyls
alkanes
*alkynes

3.
What is the name of the smallest alkyne?

butyne
*ethyne
methyne
propyne

4.
Which of the following is true about structural isomers?

Structural isomers have the same molecular formula.

Structural isomers have different physical and chemical properties.

Structural isomers have the same elemental composition.

*all of the above

5.
Alkanes do not have geometric isomers because the carbon atoms in their carbon-carbon bonds are ____.

double bonds
*quite polar
free to rotate
asymmetric

Thank you.

25 answers

5 is wrong. The others are ok. In addition to being wrong for the wrong reason, C-C bonds are NOT polar so they can't be quite polar.

1. B
2. D
3. B
4. D
5. C

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