An unknown compound,

C9H_(12)

, gave the following

^(1)H

-NMR spectrum:\ Triplet at

1.21ppm(3H)

\ Singlet at

2.30ppm(3H)

\ Quartet at

2.60ppm(2H)

\ Singlet at

7.04ppm(4H)

\ What is the structure of the compound?\ I.\ IV.\ II.\ v.

An unknown compound, C9H12, gave the following 1H-NMR spectrum: Triplet at 1.21ppm(3H) Singlet at 2.30ppm(3H) Quartet at 2.60ppm(2H) Singlet at 7.04ppm(4H) What is the structure of the compound