The chemical name for 3-ethenyl-5,5-dimethylhexa-1,3-diene is 3-ethenyl-5,5-dimethyl-1,3-hexadiene. This compound is a diene, meaning it contains two carbon-carbon double bonds. The presence of the ethenyl group indicates a vinyl group attached to the third carbon of the chain. The dimethyl groups are located on the fifth carbon of the chain. **

To draw the structural formula of buta-1,3-diene, start by drawing a straight chain of four carbon atoms. Then, place a double bond between the first and second carbon atoms, and another double bond between the third and fourth carbon atoms. Finally, add the necessary hydrogen atoms to each carbon atom to satisfy the octet rule. The resulting structural formula should show the four carbon atoms in a straight line, with double bonds between the first and second, and the third and fourth carbon atoms. **

The chlorination of 1,2-dichlorobuta-1,3-diene is typically carried out by reacting the compound with a chlorine source, such as chlorine gas or a chlorine-containing compound like N-chlorosuccinimide (NCS), in the presence of a suitable solvent like dichloromethane or carbon tetrachloride. The reaction is usually conducted at room temperature or slightly elevated temperatures under inert atmosphere conditions to prevent unwanted side reactions. The chlorination reaction results in the replacement of hydrogen atoms on the carbon atoms of the double bond with chlorine atoms, leading to the formation of the desired chlorinated product. **

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