The compound shown will give clues to its structure by which of the following spectral features ? (Assume there is no magnetic coupling with the aldehyde proton.)

 True False 

A strong , sharp absorption at about 1730 wavenumbers (IR) (True)

 True False 

An important pair of moderately strong absorptions at about 800 and 900 wavenumbers (IR)

 True False 

A sharp singlet in the region of delta = 3.5 ppm (NMR)

 True False 

A triplet at about delta = 2.2 ppm , integrating for 2 protons (NMR)

 True False 

A strong , broad absorption at about 1800 wavenumbers (IR)