Question

Which of the following is the correct IUPAC name?
(i) 3-Ethyl-4, 4-dimethylheptane
(ii) 4,4-Dimethyl-3-ethylheptane
(iii) 5-Ethyl-4, 4-dimethylheptane
(iv) 4,4-Bis(methyl)-3-ethylheptane





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Answer 1

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(i) 3-Ethyl-4, 4-dimethylheptane

★The structure of the compound is in the attachment

★The steps for identifying the compound are as follows

»1. The first step is to count the longest chain of carbons. The longest chain has to be continuous.

»2.In the second step, we have to count the number of carbons present in the chain beginning with the side which is close to the branch. We call the longest chain present in branched alkane as the parent chain.

»3.In the third step, we have to count the number of carbons present in each branch. The carbons present in branches are called alkyl groups and they contain one carbon less than the alkane group. For example, if there is one carbon present, we call the group a methyl group, if it's two carbons, then it is ethyl and so on.

»4.We have to attach the number of carbon from each substituent branch to the front of the alkyl group name.For example, if a group containing two carbons is bonded to a third carbon present in the chain, then we call the group as 3-ethyl.

»5.In the fifth step, we have to check for repeated alkyl groups. If we notice multiple groups present with the same number of carbons branched off the parent chain, we should not repeat the name. In such ins-tances, we have to use prefixes such as di-, tri-, and tetra-.

»6.In the sixth step, we have to place the names of the substituent groups before the name of the parent chain in alphabetical order. We need not alphabetize the prefixes such as di-, tri-, and tetra-.

»Now let us identify the correct IUPAC name. When we write the names of substituents, we need to write them in alphabetical order.

»So, e of ethyl comes before m of dimethyl. The number 3 is given to the ethyl group and is written first. So the correct IUPAC name is 3-Ethyl-4,4 dimethylheptane.

Hope it helps dear

Answer 2

Answer:

Option no. (I)

Explanation:

It's your answer Hope help you