## Answers

**Sol:**

*Following are the features of both the compounds i.e, *

**At low temperature both will have two kind of fluorine i.e,***axial and equatorial*and two peaks observed for them.**As the temperature increases both will show***fluxation*or*fluxionality*i.e, molecule exhibit rapid intramolecular rearrangements among their component atoms. Thus, the axial and equatorial and axial fluorine become equivalent and one single peak is observed, which is also called*coalesce*(come together to form one mass or whole) as the two peaks combine to form one single peak.**In**^{29}Si NMR,*Spin(I)= 1/2***Using***Pascal triangle*splitting can be determined.

29 Si NMR @. sifs Finst find out it's hybridi scettion, geometry vend shippe. sit 4 valence electrons + 1 e i si spad . Geometry and shape ax Triagonal bipynahidal fan - Axial Fluorine atom Feq = Equatorial fluorine votom . ?

sol: 29 Si NMR Splitting sifs Faxial K [29 si NMR Ispin ŽI (anit 1) =(2x3x} +1) : 3+1 fequitorial (a niti) - (KK 2X4+1) : 2+1 3 ...

Triplet O quartet 1 : 1 1 :2 : 1 :3 : 3 : لر 1 1 1:2:1 1: 3: 3:1 a Intensity natio pascal triangle .

sifs 29 Si NMR when teryperature increase j.e. at high tecuperature Fax : feq (Fuxation) .: Now, both axial and equitorial proton became 1 - Singlet anal equivalent 1 1 - doublet (0:2) 1 2 1- triplet (0:3) splitting I 3 3 - quartet (n=4) I (anti) 1 4 6 4 1 -quintetfor:s) Rx sx 2 + 1) s. 10 10 s. 14 Sextreff :) 1:8:10:10:8:1 + intensity Pascal triangle .: Sextet matio Fax I

Sol: High teryperature linit 29 Si NMR Coalesce @ sifs Temperature m Broadening of peaks Feo Low teaperature limit Fax • At low temperature two ty Puorine observed one is axial fluorine atorms (2) vand equitorial fluorine atoms (3) Thus, at low teryperature limit show two peals.

. As temperature increase broadening of peak occurs intill the two peak coalesce. Then, m fwrther increasing temperature, se, at high temperature linis single narrow peak of seived.

sol: 29 si NMR Thus, o n a high temp. @ sifs i.l.

A sextet Temperature ICE & low temp. 1 quartet for fax triplet for fear

sol: 29 si NMR Similarly fom Sifar- S: 2+ 4 valence electron +2 i si .- Fus -FAP •FAP - Fap r : Fred Fax FO in sp3d² hybridisation . Georyetry and sheepe = oh

sol: 29 Si NMR Similarly fom fifa 2 . Two different kind of fluorine also found here, ie fox and fea at low teryperature in splitting Fax - fear Fax (an I +1) = (2x 4x + 2+1) : 4+1 : 5 .. wuintet le 4:6:4 (2nI+1) =(2x axt+1) • 2+1 - 3 .

Triplet intensity in Mario 1:2:1 where, = number of other kind of fluorine atom in the environ- Ment I spin – for 29 si NMR.

Sol: 29 Si NMR Similarly fom filfe → At high temperature licit fax= few .. now Splitting = (anti) = (2x 6 x 1/2 +1) = 6ti = 7 . septet si - fear fax هلدر 6:15:30:18 6:1 s Intensity ratio

sol: 29 si NMR It Mighuu temperature septet, which limit get narrow at I high tecuperature + coalesce que si si Temperature hea - & Broadening of peaks Fear le In F low te cuperature ellu fax انهن quintet for Fox triplet for fear

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