Question
Asked Nov 16, 2019
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Name the following molecules according to IUPAC rules:

CH2=CH-CH2-HH2-CH3

CH3-CH2-CH2-CH2-CH2-CH2-CH3

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Expert Answer

Step 1

According to IUPAC,  there are certain rules which are used to write the name of organic compounds correctly.

1) Longest carbon chain must be selected.

2) In case of double bond in the structure, the selected chain must have the double bond.

3) Numbering should be done in such a way that the double bond should get the lowest number.

4) In case of branches, the lowest set of locants should be considered.

Name of an alkane or alkene comprises of a root word, which indicates number of carbon atoms in longest chain, and a suffix, which indicates the presence of single or double bond.

In case of alkenes, root word and suffix are separated by a number which indicates position of double bond.

Step 2

In the first compound, there is a straight chain comprising of a double bond and five carbon atoms.

As five carbon atoms are present, root word is pent

As double bond is present, primary suffix is ene

Now, the numbering (in blue) starts from the double bonded carbon as it is at one end, as shown:

Hence, the name of compound is Pent-1-ene

Step 3

In the first compound, there is a straight chain comprising of all single bonds and seven carbon atoms.

As five carbon atoms are present, root word is hept

As only single bonds are present, primary suffix is ane

There is no multiple bond, branch or functional group, so , there will be no number in the name.

Hence, the name of compound is...

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