21.
For a solution of IF5 molecules, its low temperature ¹⁹F nuclear magnetic resonance (NMR) spectrum should exhibit which of the following patterns? (¹⁹F is 100% abundant with a nuclear spin of ½； ignore any effects due to magnetic coupling to iodine nuclei.)
(A) One singlet
(B) One doublet
(C) One sextet
(D) One triplet with an integrated intensity of three and one quartet with an integrated intensity of two
(E) One doublet with an integrated intensity of four and one quintet with an integrated intensity of one
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