1.

Secondary butyl group is

Answer»

`CH_(3)-CH_(2)-CH_(2)-CH_(2)-`
`CH_(3)-underset("|")("C")H-CH_(2)-CH_(3)`
`CH_(3)-OVERSET(CH_(3))overset("|")underset(CH_(3))underset("|")("C")-`
`CH_(3)-underset(CH_(3))underset("|")("C")H-CH_(2)-`

SOLUTION :`CH_(3)-underset("|")("C")H-CH_(2)-CH_(3)`


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