4-chlorobut-1-ene is the name of which among the following alkenes?

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Multiple Choice

4-chlorobut-1-ene is the name of which among the following alkenes?

4-chloro-but-1-ene means a four-carbon chain with a double bond starting at carbon 1 and a chlorine substituent on carbon 4. The molecule drawn as CH2Cl-CH2-CH=CH2 is the same structure as CH2=CH-CH2-CH2Cl; it’s just drawn from the opposite end. If you number the chain from the end that places the double bond at C1, the chlorine ends up on C4, giving 4-chloro-but-1-ene. So this representation corresponds to the required name.

4-chloro-but-1-ene means a four-carbon chain with a double bond starting at carbon 1 and a chlorine substituent on carbon 4. The molecule drawn as CH2Cl-CH2-CH=CH2 is the same structure as CH2=CH-CH2-CH2Cl; it’s just drawn from the opposite end. If you number the chain from the end that places the double bond at C1, the chlorine ends up on C4, giving 4-chloro-but-1-ene. So this representation corresponds to the required name.

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