In the 5th overtone of an open organ pipe, these are $(N-$ stands for nodes and $A-$ for antinodes)
A$2N, 3A$
B$3N, 4A$
C$4N, 5A$
D$5N, 4A$
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C$4N, 5A$
c (c) In open organ pipe $5$th overtone corresponds to $4$th harmonic mode.
Also in open pipe, Number of nodes = Order of mode of vibration and number of antinodes = (Number of nodes $+ 1$). Here number of nodes $= 4$, Number of antinodes $= 4 + 1 =5$.
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