Question

IUPAC NAME of C6H5-CH=CH-CH3

Answer 1

C9H10
alpha-methylstyrene

Answer 2

IUPAC name of $\mathbf{C}_{6} \mathbf{H}_{5}-\mathbf{C H}=\mathbf{C H}-\mathbf{C H}_{3}$ is 1-Phenyl-prop-2-ene.

Explanation:

• The longest chain of given compound contains 3 carbon atoms. Thus the root word is 'Prop'.
• The second carbon has a double bond, thus the nature of bonding is denoted by '2-ene'.
• The substituent group present in the structure is $C_6H_5$ which is called phenyl and it is located in first carbon
• Thus the name of the compound must be prefixed with "1-phenyl".
• For the numbering of the carbon atom and location of the substituent group refer to the attachment.
• According to the structure given in the attachment, the IUPAC name of the given compound is 1-Phenyl-prop-2-ene.

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