Lesson 1 Review Answers

1.      Name the following molecules.

2.      Draw the following molecules.

3.      Draw, then name, the five possible isomers of C₆H₁₄.

4.      Draw, then name, the four possible isomers of C₃H₆Cl₂.

5.      The below names are incorrect.  State what is wrong and give the correct name.

a.      2-ethylpentane     The longest chain was not used.  It should be named 3-methylhexane

b.      5,5-dimethyl-3-ethylhexane        You want to number the parent chain so the branching occurs at lower instead of higher numbers. The correct name is 4-ethyl-2,2-dimethylhexane.

c.      2-dimethylpentane          Since there are two methyl groups the numbers should have 2,2.  The correct name is 2,2-dimethylpentane.

d.      2-fluoro-4-chloroheptane            When naming the branching needs to be listed alphabetically.  The correct name is 4-chloro-2-fluoroheptane.

6.      Predict the products for the following reactions.

7.     
A compound has the following IR and when burned on a copper wire, no change was seen in the flame.  What is most likely to be the class of the organic molecule?

The molecule is an alkane.  The IR shows that the compound could be either an alkane or alkyl halide, but the negative flame test proves it’s an alkane.

8.      Name all the bond types in an alkyl halide, and where you’d expect to see them in an IR.

·        C-C and C-Cl bonds absorb in the fingerprint range

·        C-H bonds absorb to the immediate right of 3000 cm^-1 (between 2850 – 2950 cm^-1)

9.      Name the following type of formula (molecular, structural, condensed structural, skeletal) then draw out the other 3 types.