Question

28 How could you tell the two compounds apart using IR spectroscopy?

Answer 1

(B) This two compounds distinguish by IR spectra as different of C=o streching frequeney of two compounds. From Hooks Low streching frequency, J = tek ; K= force constant. u= reduced mass. Again, force constant (K) depends on the bond order i. e ka Bond onder higher the bond order higher will be force constant je higher will be streching frequency. Taka Bond onder] hear two compounds contain different hetero atom je N and O. Weimon oxygen(o) is more electronegativity than nitrogen (N). so, the lone pair of oxygen will not deloca- used with carbonyl carbon as possitive charge unstabu on oxygen atem. So e=0 does not get single bond characterie bond order = 2 but the lone pair of nitrogen (N) will be delocalised with c=0 and coo gets some single bond Character & overau bond onder will be = 15

compound A so, the band order of c=o in is = 1.5 The bond onder of czo in is=2 compound B We know Jak & Bond order se the streching frequeney of c=o in Compound B is larger than the streching frequeney of croin compound A. overau bond order of czo is = 1.5 271 2 bond order of c=o is=2