Question

• Write the IUPAC name of ${\left({\mathrm{CH}}_3\right)}_3\mathrm{CCHO}$

Answer 1

IUPAC name:

• The worldwide using chemical names are created and developed by IUPAC.
• There are certain rules for naming the compounds.

Rules for naming a compound:

• The longest carbon chain should be identified whether it may be a straight or branched chain.
• The numbering of the carbon chain should give the lowest number to the functional groups.
• If the same substituent is attached to the same carbon, then it will be called di, tri or tetra.
• The different names should be used for different substituents present in the compound and also mention their positions.
• If two substituents present at the same carbon, on naming this the substituent, the alphabetically first substituent should be named first.

Naming given compound:

${\left({\mathrm{CH}}_3\right)}_3\mathrm{CCHO}$:

Step $1$: Finding the parent chain

• As the given compound contains five carbon out of which three-similar groups are attached to the same carbon. In which two of them were locants so, totally three carbon, the root word for this is the prop.

$\mathrm{C}-\stackrel{|}{\underset{|}{\mathrm{C}}}-\mathrm{C}$

Step $2$: Naming and positioning the locants

• In the compound, two same locants are there i.e dimethyl that is attached at the position of the second carbon so the position is $2,2$-dimethyl

$\underset{1}{\mathrm{C}}-\stackrel{\stackrel{\mathrm{Me}}{|}}{\underset{2}{\underset{\mathrm{Me}}{\underset{|}{\mathrm{C}}}}}-\underset{3}{\mathrm{C}}$

Step $3$: Finding a functional group

• There is one functional group in compound I,e: $\mathrm{CHO}$ aldehyde gives suffix of -al.
• Now on adding prefix and suffix, the IUPAC name of the compound is $2,2-$dimethylpropanal.