The alkene CH3 CHCH CH2 CH3 is named 2-butene. It is a four-carbon alkene with a double bond between the second and third carbon atoms in the chain. The name "2-butene" indicates the position of the double bond in the carbon chain. **

The skeletal formula of CH3 is simply a line representing the carbon atom with three hydrogen atoms attached to it. This is a simplified way of representing organic molecules where carbon atoms are not explicitly shown, and only the bonds and other atoms are depicted. In the case of CH3, the carbon atom is assumed to be at the end of the line with three hydrogen atoms attached to it. **

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CH3 and H3C both represent a methyl group in organic chemistry, but the difference lies in the way they are written. CH3 is written with the carbon atom first, followed by the hydrogen atoms, while H3C is written with the hydrogen atoms first, followed by the carbon atom. Despite this difference in notation, both CH3 and H3C represent the same functional group in organic molecules. **

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Practical exam 318 is a hands-on assessment that evaluates a candidate's ability to apply their knowledge and skills in a real-world scenario. It typically involves performing tasks or solving problems related to a specific subject or field of study. The exam is designed to test the candidate's practical understanding and application of concepts, ensuring they are capable of performing the required tasks in a professional setting. Candidates may be required to demonstrate their proficiency through practical exercises, simulations, or other hands-on activities. **