Question

what's the IUPAC names of these ​

Answer 1

Answer:

The carbon atoms have been numbered to help you to name the compound.

Identify the functional group. ...

Find the longest carbon chain. ...

Number the carbon atoms in the longest chain. ...

Look for any branched group, name them and give their position on the carbon chain. ...

Combine the elements of the name into a single word.

Answer 2

Answer:

1) 3-Methyl Hex-1-ene

2) But-1-en-3-yne

3) 2,2,3-TriMethyl Pentane

Explanation:

1) 3-Methyl Hex-1-ene

Reasons:

• Longest chain is of 6 carbons. Word root will be of 'Hex-'
• Methyl substituent is present on 3rd carbon
• Double bond present at 1st carbon(Numbering starts from there because double bond is given higher priority). Thus the primary suffix will be '-ene'.

2) But-1-en-3-yne

Reasons:

• Longest chain is of 4 carbons.Word Root will be 'But-'
• Double bond has higher priority than triple bond in naming so numbering starts from there, therefore the double bond is present at 1st carbon primary suffix will be '-ene' and second primary suffix is of '-yne' for carbon at 3rd position( I am assuming that 3rd carbon is a triple bond because pic is not clear there)

3) 2,2,3-TriMethyl Pentane

Reasons:

• Longest chain is of 5 carbons so word root will be 'Pent-'
• There are 2 Methyl groups present on 2nd carbon.
• There is one methyl group on 3rd carbon.
• We start numbering from left because of Lowest locant rule as it gives us lowest numbering according to IUPAC nomenclature.

NOTE

( Secondary Prefix + Primary Prefix + Word Root + 1° suffix + 2° suffix)

( Substituents  + Cyclo/bicyclo + Carbon atom number + saturation(double triple bond)    + Functional group )