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78

Answer

The signal of the proton X is a doublet, since the two equivalent protons X are coupling with a single proton A (See page 74 for an explanation).

So far you have come up with the following answers:
  1. Fine structure of the signal Due to coupling with
    Singulet (M = 1) } other
    equivalent
    protons
    Doublet (M = 2)
    Triplet (M = 3)

    The general rule therefore is:

    The signal of one or several equivalent protons is a multiplet with a multiplicity of M = n + 1, if the proton(s) couples with n other equivalent protons!

  2. Multiplicity
    M = n + 1    		 Relative intensities
    of the individual
    multiplet lines
    M = 2
    M = 3
    M = 4

    The general rule therefore is:

    The relative intensities of the individual multiplet lines follow the same patterns as the nth binominal coefficients!
Now try again to solve the problem!