iisc 2008 question paper

8/9/2019 iisc 2008 question paper

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INDI N INSTITUTE OF SCIENCE

BANGALORE 560012

Program ResearchEntrance Paper Chemistry

Paper CodeCY

Day & Date

SUNDAY,7TH

APRIL 2008

Time

9.00 A.M. TO 12.00 OO


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6. The base hydrolysis of [ ~ o ~ l ( ~ ~ ~ ) ~ i ] ~ f p r o c e e d sn a

7.h e orrect

formulation for tem(cyclopentadieny1) t i t a n i u rnv complex is

(A)

[Ti(q5-cs~5)41

@) [~ ib l ' - c )41

C )

T ~ ( ~ ' - C S H ~ ) ( ~

- ~ 5 ~ 5 ) 3 1

D)~ i q ~ - ~ s ~ s ) z q l - ~ ~ ~ ~ h l

8. The oxidation stateof iron in [ ~ e - q ~ - ~ ~ ) ~ ]F~ ] s

9. A complex of N i o , ENiC12(PPh3)2]is paramagnetic. The analogous P d ocomplex is diamagnetic.The number of isomers that wiii exist for the nickeland

the

palladium

complexes

are

(A) One,OneB)One Two(C)Two,

ne

@)Two,Two

10. The bond angle in C1O4- is

(A)45'

B)90

(C) 107.5

D) 109.5"


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21. Phosphoric ndphosphorous acid

{A)Have zero and one P-H bondB)have noP-H bonds(C) re

both tripotic

D)are

bo h dipro ic

22. A t 2 5 C , ~ = 6 . 8 x 1 0 5 f o r N p g ) 3Hz g)2NH3 g).TheK,fortl-1is

reaction is

23. Wbich of he foiiowing has the sm llestbond enthalpy

(A) Si-H

@)

c EI

(C) Ge-H

@ Pb-H

24. The stru ture of s l transforms to NaC1 under high pressure During thisprocess

the

coordin tion number

of s

and

C

ch nge fiom

(A) 8:8@) 6:6

C) 2:12

D) 8:6

25 Thesymmerry

elements

present inp-difluorobenzeneare


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35. The MAJOR product n the reaction etween o-hydroxyacetophenone andbenzaldehyde in th presenceof NaOH is

36. Which reagent is suitable to c rry ou t th folIowing transformation

37. Identify thM JOR

product inth

foliow ing transformation

i

MeMg r

ii) H,O+

iii H2S 4


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38. TheMAJOR produ t in th followingreaction is

Na

39. Identify the produc s X, Y iu the following sequence

40 How rnany signals will be observed in th proton decoupIedk

for

hexameihylbenzene


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41. Identify th MAJOR product obiained when th compound shown below istre ted

with HCI.

42. TheII

N R

Spectrum of norganic

compound of moIecular formulaC H8

exhibited only

singlet

at = 1.9 ppm.The compoundis:

(A)1 butene

B) cis-2-butene

(C) trans-2-butene@)

cyclobutane

43. Idenbfy theMAJOR product fomed in ihe following reaction


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44. Which reagent would facilitate th foiiowing transforrnation.

Ql o

4L W 3

(B) n BuLi(C) ii. NaOH

D

MS1

45. Identify th MAJOR product n th followingreaction


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46. What is the productof the following reactioii

a O CHO 2021uH

(A)catechol

13) salicylic acid

C )

o-benzoquinone

(D) salicyl lcohol

47. Which reapnt is used for ie conversionof benzil io benzilic acid?

(A) conc. H l

B)

conc.KOH

C)TiC 4

Dl 4

48. Whichof the followingmolccules areNOT oplically active


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49.

Which technique would you use to quickly distinguish methyl beiizo te fromplienyl acetate?

(A) HNMR(B) Mass spectrometryC)Vapor

pressure osinometry

(Dl Elemental nnlysis

50 Acetone and acetoiie-ci6fiex deuter ted

acetone) may be readilydistinguished hy:

(A) Thin laycr cl~romatography

(B) W-Visible

absorption)

spectroscopy

(C)

I3cNMR

spectroscopy

(D)Mass spectrometry

51. n a Grignard reaction which of the ollowing dry solvents CAN ti used asreplacement

for anhydrous ether

(A) Acetone(B) Ethyl acetate(C) etrahydrofurm

(D) Tsoprupanol

52. n which polymer is - -CFz-CF2-1,- he cpeating unit ?

A) Polys yr nB) Polyvinyl chloride

(C) Tefion(D) yaluronic acid


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53. The swengih of the coupling betwen geminal protons in th foiiowingmolecules

(A) ncreases s the sizeof the ~g increases(B) ecreases s the sizeof th ring incre sesC ) emains the same

@

No relationbetween th size of the ring and the coupling

54. The expected spectral pattern n ihe proton coupled 3cNMR spectrurn of arnixture

ofequal weights of CHC 3and l c~clould be


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55

Identify

th

product ofh

reaction

56. Whats

the productof the ollowingreaction


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57. Tlie increasing order of the chemical shift of th indicated proton in thefollowing s ri s of cornpounds is:

(A) TiI

B) III

C) I


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59. Tdentify tli product of th reaction

(i)Et2NH HCI

E tN

. ormalin

(ii) e[

(iii)Et N

CHOI

60. The rel tive ease of th reductionof the following substrate wit N H4


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61. Identify the M JOR product of th reaction

62. Theproduct ofth following reaction is


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63. The product of the bove reaction (Q.N0.62 undergoes further reaction withBrdAcOH, followedby reaction with LiOW MF to giv nother product,which exhibits characteristic R peaks

at 1732 and 1680cm- . This product is:

64.Identify

the M JOR

productof he reaction

AIBN


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92. Cdcuiate th fractionof the volurneofAl f.c.c)occupied by its atoms

(A)0.255

B)0.740

(C)0.414

@ 0.875

93

he

composition

of a s mpleof iron oxide is Fe 0~~30 hat percentage of Fe

is in 3 t?

(A) 0.07%

@)7.0%

(C)30%

@ 15.1 9


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97. A n elecbon massm) n a naphthalene may be modeled as a particie in aTWO DIMENSIONALbox of dimensions a and 20. The expression for theal1owe.d energy levels of the p rticle are nl nd z re quantum numbers thattake

values

1 2 3.. . :

98. The wave function for a particle P confined to a ring of radiusr = a seeFigure)

is

Nexp(i , q being the ngle CO-ordinateepresenting its

positionlong the ring. The value of N is


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iisc 2008 question paper

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