Question

The IUPAC name of the given compound is 4, 5-diethyl-7-methyldecane.

• A. True
• B. False

Answer 1

The correct option is A

True

step:Identity the longest chain.

$\Rightarrow$10 carbon atom chain $\Rightarrow$ward root=dec

Given compound is alkane $\Rightarrow$primary suffix=ane

We can number the chain in 2 ways.

Step 2:number the carbon atoms in the chain to give the lowest set of locants to the three substituents.

Right numbering gives locant= {4,5,7}

Wrong (reverse) numbering yeilds={4,6,7}

Secondary prefix=4, 5-diethyl-7-methyl

Hence the IUPAC name is:

4,5-Diethyl-7-methyldecane

Answer is TRUE

In the secondary prefix, alphabetically ethyl precedes methyl. we do not consider 'd' in diethyl'.

Words like 'di' 'tri' etc .are ignored.