Which of the following names is correct? 1-propyl-2-pentene 3,3-diethyl-4-propene 2-ethyl-3-pentene 2-methyl-1-butene None of the above are...

Which of the following names is correct?

	1-propyl-2-pentene
	3,3-diethyl-4-propene
	2-ethyl-3-pentene
	2-methyl-1-butene
	None of the above are correct.

Expert Solution

The name 1-propyl-2-pentene is not correct because in the structure of this compound a double bond is present at carbon number 2 of the parent chain and a propyl substituent is present at carbon number 1. This is not possible because the priority of a double bond is higher than that of a propyl substituent therefore, 1-propyl-2-pentene name is wrong.

Similarly, the names 3,3-diethyl-4-propene and 2-ethyl-3-pentene are wrong because in both these names the higher priority double bond is assigned higher numbering in the carbon chain as compared to the alkyl substituents. Here, the alkyl substituents are given lowest numbering in the parent carbon chain. Hence, both the names 3,3-diethyl-4-propene and 2-ethyl-3-pentene are wrong.

In the name 2-methyl-1-butene, the double bond is assigned the lowest carbon number in the parent carbon chain as compared to the methyl substituent. The structure is shown as follows:

Hence, the name 2-methyl-1-butene is correct.

queen_honey_blossom answered 1 month ago

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