$1.(1)$ Draw the Lewis structure of methane.

a$.(1)$ When the model is moved, is there any difference between the two structures?

b$.(2)$ Could the term equivalent be used to describe the four hydrogen atoms of methane?

Explain the test for chemical equivalency.

$2.(2)$ Draw the Lewis structure of ethane. Label each carbon as $1\backslash$deg $,2\backslash$deg $,3\backslash$deg $,$ or $4\backslash$deg $.$

$3.(4)$ Draw the Lewis structure of propane. Label each carbon as $1\backslash$deg $,2\backslash$deg $,3\backslash$deg $,$ or $4\backslash$deg $.$

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$4.(5)$ Draw the Lewis structure of butane. Label each carbon as $1\backslash$deg $,2\backslash$deg $,3\backslash$deg $,$ or $4\backslash$deg $.$

$5.(5)$ Draw the Lewis structure of methylpropane. Label each carbon as $1\backslash$deg $,2\backslash$deg $,3\backslash$deg $,$ or $4\backslash$deg $.$

a$.(2)$ Butane and methylpropane are constitutional or structural isomers. Generally speaking,

how do you determine if two molecules are constitutional isomers?

$6.(4)$ Draw the Lewis structures of the two isomers of chloropropane. Name each isomer.

$7.(2)$ Draw the Lewis structures of cyclopentane and chlorocyclopentane.