Asked Nov 16, 2019

Name the following molecules according to the IUPAC rules:


5. CH3-CH2-CH2-CH2-C-CH3
6. CH3-CH-CH2-CH3

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O II 5. CH3-CH2-CH2-CH2-C-CH3 NH2 6. CH3-CH-CH2-CH3 13.


Expert Answer

Step 1

IUPAC name of a straight chain compound containing single functional group, consists of :

root word + primary suffix + secondary suffix.

Here, root word  indicates number of carbon atoms in longest chain

Primary suffix indicates the presence of single or multiple carbon-carbon bond. Hence, it is either ane, ene or yne. The last 'e' is dropped while writing the name.

Secondary suffix indicates the functional group present in the compound.

The rules to be followed while writing the name of such compounds are :

1) Longest carbon chain must be selected in such a way that functional group is included in that chain.

2) Numbering should be done in such a way that the functional group gets the lowest number.

Step 2


In this compound, there is a straight chain comprising of a ketone group and six carbon atoms.

As six carbon atoms are present, root word is hex

As only single carbon-carbon bonds are present, primary suffix is ane

Functional group here, is a ketone group, so, suffix is one

Now, the numbering (in blue) starts from that end at which ketone group gets lowest number , as shown:

Hence, the name of compound is Hexan-2-one.

Step 3


In this compound, there is a straight chain comprising of an amino group and four carbon atoms.

As four carbon atoms are present, root word is but.

As only single carbon-carbon bonds are present, primary suffix is ane.

Functional group here, is an amino , so, suffix is amine.

Now, the numbering (in blue) starts from that end a...

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