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Question

The IUPAC name of the compound

A
2(N-Methylcarbamoyl)-1-methylcyclopentane
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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

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