Number of primary carbon atoms present in 3-E | vedclass

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(D) primary carbon atom is a carbon atom that is bonded to only one other carbon atom. In the structure of $3-$Ethyl$-2,4-$dimethylheptane,the termina

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$6$

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(D) primary carbon atom is a carbon atom that is bonded to only one other carbon atom. In the structure of $3-$Ethyl$-2,4-$dimethylheptane,the terminal methyl $(-CH_3)$ groups are primary carbons. Looking at the structure: $1$. The $C-2$ position has one methyl group attached. $2$. The $C-3$ position has an ethyl group attached,which ends in a methyl group. $3$. The $C-4$ position has a methyl group attached. $4$. The main chain heptane has two terminal methyl groups. Counting these: - Two methyls at $C-2$ (one is part of the chain,one is a substituent). - One methyl at the end of the ethyl group at $C-3$. - One methyl at $C-4$. - Two terminal methyls of the heptane chain. Total primary carbon atoms = $6$.

Column-$I$ (Acids)	Column-$II$ ($IUPAC$ name)
$A$. Phthalic acid	$1$. Hexane$-1,6-$dioic acid
$B$. Oxalic acid	$2$. Benzene$-1,2-$dicarboxylic acid
$C$. Succinic acid	$3$. Pentane$-1,5-$dioic acid
$D$. Adipic acid	$4$. Butane$-1,4-$dioic acid
$E$. Glutaric acid	$5$. Ethane$-1,2-$dioic acid

Number of primary carbon atoms present in $3-$Ethyl$-2,4-$dimethylheptane is?

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