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10. Prepare a qualitative M.O, diagram for nitric oxide (NO) and answer the following questions. How does your diagram account for differences in the electronegativity between oxygen and nitrogen? b. What is the bond order of NO? c. Is NO diamagnetic? Why or why not? d. [NOJBF4 is an important source of NO for synthetic organic and inorganic chemists. NO is also known. Compare the bond orders of NO, NO and NO e. NO' exhibits an IR band at 2377 cm while NO has a band at 1470 cm a. Account for the dramatic difference. Free (unbound) NO gas has an infrared band at about 1876 cm. Upon binding to a metal, the IR band decreases to about 1850 cm. What accounts for the decrease? f

Answer 1

Mo Diagram of No Emmy 29+ 1 1 1 2p - 2012 - ak- 2p 2p 1 TB , t 14 apy - -- - - 25 - -- Nools

(a) Atomic oubital energy correlates with electronegativity, as the more electronegative atom bolds their electrons more tightly and lowering their exprgies. In the M.O diagram of no, the energy of oxigen is lower than Nitrogen. Hence oxigen bas higher electronegativity than nitegen It can understand from M.o diagran Bond ordey CBO)- I Choq bosdingelectrons - O no fastborking ens) Bland Bonding éns = 10 Motibonding Ens = 5 d. de B.0=C10-5) = 5 - 2.5 No i Paranagnetic It is not diamagnetic It has unpaired electrons in astibending- molectar Orbidali Due to one unpaivad electron present it should be a paramagnetic

cds wol NO. B.0 = CNO of Bonding ãos - ne ens -C10-5) = 5-25, * NOW] No of Holal eledeien = 14 elections In mo diagram of not, there is the electron less in dotibosding moledor- orbital Cat 2px) :Bonding ēns = 10 03 ashbonding és = 4 p uikiausios B.O=C10-43 = 2 =3, © [6]. number of total ens = 16 electrons Is mo diagranig no thone is the electries will be added compare with

MO diagram present in of No which will be tapy orbital i Bonding ens = 10 Astibönding ens = 6 child to his p astatue Stue pour les Bio= C10-6) = 42 = 2% on a A order of B.O is not >NOJNO We know that Bond osdorg Not is 3 and Bond ordero no is a. Kbeneuon the numbes y bond increases then it- sbould have higher le Valuees. ... IR of Not> IR of No cee Boo, Not No)

(t) Upon binding to Medal q no there should be decromby ie verlies. Tot is dae lo T-backbonding on T-back donation, Hone the eledens feom drogbital of metal do arbbonding orbital NO over transjared. Henco no stretebing frequency- decreases and Metal - no bond becene stbergeben. i