19. In a two-dimensional crystal lattice, which one of the following indices corresponds to the smallest density of lattice points?(A) (10)(B) (13)(C) (21)(D) (11)(E) (41)

6. Which of the following descriptions about the TLC analysis of Compound G and H is incorrect? (A) If "TLC 1" is a normal phase silica TLC plate, Compound H is more polar than Compound G.(B) If Compound G and H are analyzed again with a reverse phase silica TLC plate in EtOAc:n-hexane (3:2) then "TLC 2" could be the result.(C) "TLC 2" could be the result of running a normal phase silica TLC plate with EtOAc:n-hexane (2:3).(D) The Rf values of both compounds would change if the TLC is run with different ratios of EtOAc and n-hexane.(E) All of the above are incorrect

19. In a two-dimensional crystal lattice, which one of the following indices corresponds to the smallest density of lattice points?
(A) (10)
(B) (13)
(C) (21)
(D) (11)

(E) (41)

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