The IUPAC name of CH3-CH=C(CH3)-COOH is:

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The IUPAC name of $CH X_{3} - CH = C (CH X_{3}) - COOH$ is:

A2-methylbut-2-enoic acid
B2-methylbut-3-enoic acid
C2-ethylprop-2-enoic acid
D3-methylbut-2-enoic acid

Answer: A

The longest chain containing COOH has four carbons (C-1 is the acid carbon). The double bond is between C-2 and C-3 and the methyl branch is on C-2. The name is 2-methylbut-2-enoic acid.

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The IUPAC name of CHX3​−CH=C(CHX3​)−COOH is:

Answer: A

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The IUPAC name of $CH X_{3} - CH = C (CH X_{3}) - COOH$ is: