What is the name of the molecule below? A) 2-pentene
B) pentane
C) 2-pentyne
D) 2-pentane

this is called 2-pentene. It's an alkene because it has a double bond and it's not a cyclic compound it can also be illustrated as

CH3-CH=CH-CH2-CH3

we call it 2-butene because of the position of the double bond

it's c. elements are placed in rows based on how may valencies electrons have.

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