name CH3 - CH = C - CH3
!
Cl
You see that it's impossible to draw structures on the board. I can't tell where the Cl atom is attached; however, the name will be number-chloro-2-butene such as 1-chloro-2-butene, or 2-chloro-2-butene,etc. I assume from the number of H atoms, that the Cl is attached to the 3rd C from the left. That would make it 2-chloro-2-butene.
The best way to draw simple structures on here is to use the format uaed by old type setters.
CH3 - C(H) = C(Cl) - CH3
so (Z or E) 2-chloro-2-butene
or you could use
(Z or E) 2-chloro-but-2-ene
The name of the given molecule is 1-chlorobut-2-ene.
To arrive at this name, we need to follow the IUPAC (International Union of Pure and Applied Chemistry) naming rules for organic compounds:
1. Identify the longest continuous carbon chain: In this case, we have a chain of four carbon atoms.
2. Number the carbon atoms in the chain: The carbon atoms should be numbered in a way that the double bond gets the lowest possible number. In this case, the double bond starts at the second carbon, so we number the chain starting from the carbon closest to the double bond.
CH3 - CH = C - CH3
1
3. Identify and name the substituents: In this case, we have a chlorine atom attached to the third carbon of the chain. We use the prefix "chloro-" to denote the chlorine substituent.
CH3 - CH = C - CH3
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Cl
4. Combine the names of the substituents and the main chain: The name of the main chain is "but-ene" since we have four carbon atoms with a double bond. We combine this with the substituent "chloro-" to get the final name.
1-chlorobut-2-ene
So, the name of the given molecule is 1-chlorobut-2-ene.