The correct IUPAC name of the following structure is:

4-methylbutanedinitrile

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3-Methylhexanedinitrile

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4-Methylhexanedinitrile

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2-methylbutanedinitrile

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Solution

The correct option is B 3-Methylhexanedinitrile
More than one chain terminating group:

If more than one chain terminating groups of the same type are present, then the principal chain is selected including the functional groups.
Numbering is done from that side which gives lowest locant to unsaturation and substituents.

The correct IUPAC name is 3-Methylhexanedinitrile

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