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Question

IUPAC name of the compound

H2NO||CCH|CHCH3|CH3C(CH3)3?


A

3-Methyl-2-(1, 1-dimethylethyl)butanamide

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B

3, 3-Dimethyl-2-(1-methylethyl)butanamide

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C

2, 2-Dimethyl-2-(1-methylethyl)butanamide

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D

None of the above

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Solution

The correct option is B

3, 3-Dimethyl-2-(1-methylethyl)butanamide


Let's decide about the parent chain first. There are two possibilities.

In the figure I Number of substituents = 2

{at C2 and C3}

In the figure II Number of substituents = 3

{at C2, C3 and again C3}

Therefore, the parent chain will be

word root = But

Only single bonds between carbon.

Therefore, primary suffix = ane

Functional group NH3 Amide

The secondary suffix - amide

So, it will be butanamide

Now, let's take a look at substituents.

There are two methyl groups at C3.

Therefore, 3,3 -dimethyl

And for C2 the primary chain consists of two carbons and one methyl group attached to first carbon.

Therefore, 2-(1-methylethyl)

So, the IUPAC name of the compound is 3,3-Dimethyl -2-(1-methylethyl)butanamide


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