A box labeled “C₆H₁₀ isomers” contains samples of three compounds: A, B, and C. Along with the compounds are the IR spectra of A and B, shown in Fig. P14.36. Fragmentary data in a laboratory notebook suggest that the compounds are 1-hexyne, 2-hexyne, and 3-methyl-1,4-pentadiene. Identify the three compounds.

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percent transmittance 100 80 60 40 20 0 2.6 2.8 3 3.5 4 4.5 wavelength, micrometers 5 5.5 6 7 8 9 10 11 12 13 14 1516 m compound A 3800 3400 3000 2600 2200 2000 1800 1600 1400 1200 1000 wavenumber, cm-¹ 800 600