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Answers:

The molecule
Structure formula

can be characterized as follows, based on the number of signals and their integrals:

  1. equivalent protons number of protons
    a) (CH3)2-C< 6
    b) -OH 1
    c) -CH2- 2
    d) -CO-CH3 3
  2. relative intensities:
    I(CH3)2 : ICH3 : ICH2 : IOH = 6 : 3 : 2 : 1

Now assign the signals (I) ... (IV) to the correct groups of equivalent protons a) ... d) !