MCQ
The $IUPAC$ name of 
  • $3-$ethyl$-4-4-$dimethylheptane
  • B
    $1, 1-$diethyl$-2,2-$dimethylpentane
  • C
    $4, 4-$dimethyl$-5 ,5-$diethylpentane
  • D
    $5, 5-$diethyl$-4,4-$dimethylpentane.

Answer

Correct option: A.
$3-$ethyl$-4-4-$dimethylheptane
a
The open-chain structure of IMAGE $01$ will look like IMAGE $02$.

According to the structure as referring to IMAGE $02$, first of all, long chain is selected, i.e., here it is of $7$ carbon.

So, it will be named as heptane and then third and fourth carbon contains one ethyl and $2$ methyl group.

So it will be named as $3$ - Ethyl -$4, 4$-dimethylheptane.

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