Identify a likely source for the fairly intense signal at 1621 cm1. Select all t

Question

Identify a likely source for the fairly intense signal at 1621 cm1. Select all that apply The tautomer of the proposed structure exhibits a Ca N bond, which is likely to be the source of the signal at 1621 cm-1. Conjugated C-N bond would likely appear at a higher wavenumber than 1621 cm1, but this C N bond is unconjugated. Unconjugated Ca N bond would likely appear at a higher wavenumber than 1621 cm1, but this C- N bond is conjugated. The location of the signal is appropriate if the source of the signal is indeed the C# N bond. There are other signals in the range 1600-1850 cm-1 There are no other signals in the range 1600-1850 cm1 We would expect this C-N bond to produce a strong signal in the IR spectrum. SHOW HINT

Explanation / Answer

Answer-

In the given structure there is following possiblities of IR frequencies-

C-H , C=C , C-N , C=N , C-C ,C-H,

in which the most probable the said IR frequency might be because of C=C str frequency which is 1640-1680 cm-1, but for C=N str it is 2220-2260 cm-1 .

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