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B
N-Methyl-2-methylcyclopentanecarboxamide
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C
1-Methyl-2-N-methylcyclohexancarboxamide
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D
1-(N-methylcarbamooyl)-1-methylcyclopentane
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Solution
The correct option is B N-Methyl-2-methylcyclopentanecarboxamide The longest carbon chain starting from carbon of cyclopentane ring attached to amide group would be the parent ring. Hence, in face parent chain is cyclopentane ring. Alkyl(−CH3) as a substituents while numbering.
Amides (−CONH2,−CONHR,−CONR2) Suffix: amide/ carboxamide Hence, the correct IUPAC name is N-Methyl-2-methylcyclopentanecarboxamide