Question

I am doing the spec chemistry (IR and NMR) I couldn't upload thepicture so I just measured approximately IR data and NMR dataplease help me to find the structure.

Identify the structrue of the compound using the giveninformation.

(a)C₄H₈O₂

IR data: 2300-3400cm^-1 broad strong,1700cm^-1 strong, 900~cm^-1 medium broad1200-1400cm^-1 medium

NMR data:( 1-1.5ppm 3H triplet), (1.7-1.9ppm 2H sextet),(2.3-2.7ppm 2H triplet), (11.7ppm)

(b)C₁₀H₁₃NO₃

IR data: 3100-3600cm^-1 medium broad,2800-3000cm^-1 medium, 1600cm^-1 medium, 1500and 1300cm^-1 strong, 1100-1000cm^-1medium,700,750 and 900cm^-1 medium and

NMR data: (0ppm singlet) (1.5-1.9ppm multiplet) (2.2-2.3ppmsinglet) (3.7-3.9ppm triplet) (7.2-7.4ppm doublet) (8.1-8.3ppmdoublet)

(c)C₉H₁₀O₂

IR data: 1695cm^-1 strong absorption peak

NMR data: TMS, (1.44ppm triplet) (4.08ppm quadret) (6.98ppmdoublet) (7.81ppm doublet) (9.87ppm singlet)