on a ir spectrum what is the difference between weak and medium aromatic ring do

Question

on a ir spectrum what is the difference between weak and medium aromatic ring does it have to do CH double or single bonds on the ring. Can you help with why it is B and D and F are eliminated

00 90 80 70 60 50 30 20 1700 4000 3000 wave number (cm 1) Which compound matches the IR spectrum best? 000 Can eliminate A because br has a 500-600 spectrum Eliminate E because of 3300-3500 spectrum N-H Eliminate C because of single C-H bonds 2850-2960 Functional Group Ai lem Intensity Functional Group Absorption om Intensity Medium N-H 1030-1200 Medium Medium Medium 1715 Medi Alkyl halide Carboxylic acid 600-a00 Strong 500-600 Strong 2500-3100 Strong, broad 1540 Strong Medium

Explanation / Answer

Eliminate B becuse aldehyde group generally comes between 1720-1740 cm-1

Elimininate F because mono substituted aromatic have strong peak at 680-710 cm-1

answer is D because intensity of keto peak is so strong.

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