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The structure of isobutyl group in an organic compound is:

1. CH3—CH—CH2—CH3
2. CH3—CH2—CH2—CH2—
3. CH3—CH—CH3
4. CH3—CH2—CH3

Correct answer: CH3—CH—CH2—CH3

Solution

The isobutyl group has the structure CH3—CH—CH2—CH3, where a branched methyl group is attached to the second carbon of a butyl chain.

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