Question

Write IUPAC name of $\mathrm{HCHO}$ , ${\mathrm{CH}}_3\mathrm{CHO}$ and ${\mathrm{CH}}_3{\mathrm{COCH}}_3$.

Answer 1

IUPAC name

• The International Union of Pure and Applied Chemistry is abbreviated as IUPAC.
• It allows each compound to have its own unique name.

IUPAC name of $\mathrm{HCHO}$

Determination of Root Word

Select the continuous chain with the maximum number of carbon atoms

Here the chain is having 1 carbon atoms, hence root word will be “meth”

Determination of names and positions of Locants

There is no substituent in $\mathrm{HCHO}$

Determination of Suffix

As this compound is unsaturated -ane- can be used.

The function group in $\mathrm{HCHO}$ is aldehyde, so the secondary suffix is al.

• IUPAC name is thus said to be Methanal.
• The compound's common name is formaldehyde.
• 

IUPAC name of ${\mathrm{CH}}_3\mathrm{CHO}$

Determination of Root Word

Select the continuous chain with the maximum number of carbon atoms

Here the chain is having two carbon atoms, hence root word will be “eth”

Determination of names and positions of Locants

There is no substituent in ${\mathrm{CH}}_3\mathrm{CHO}$

Determination of Suffix

As this compound is unsaturated -ane- can be used.

The function group in ${\mathrm{CH}}_3\mathrm{CHO}$ is aldehyde, so the secondary suffix is al.

• IUPAC' name of ${\mathrm{CH}}_3\mathrm{CHO}$ is Ethanal.
• The common name for ${\mathrm{CH}}_3\mathrm{CHO}$ is acetaldehyde.

IUPAC name of ${\mathrm{CH}}_3{\mathrm{COCH}}_3$

Determination of Root Word

Select the continuous chain with the maximum number of carbon atoms

Here the chain is having three carbon atoms, hence root word will be “prop”

Determination of names and positions of Locants

There is no substituent in ${\mathrm{CH}}_3{\mathrm{COCH}}_3$

Determination of Suffix

As this compound is unsaturated -ane- can be used.

The function group in ${\mathrm{CH}}_3{\mathrm{COCH}}_3$ is ketone, so the secondary suffix is one.

• IUPAC' name of ${\mathrm{CH}}_3{\mathrm{COCH}}_3$ is Propanone.
• The common name for ${\mathrm{CH}}_3{\mathrm{COCH}}_3$ is acetone.