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Q.136   In HPLC analysis what type of column would you prefer?
(A)    A column with high HETP and high number of plates
(B)    A column with low HETP and low number of plates
(C)    A column with high HETP and low number of plates
(D)    A column with low HETP and high number of plates

Q.137   In an optically active organic compound a chiral carbon has the following attached groups:
[P]    -C0—CH3  
[Q]    -C—OH
[R]   -CH = CH2
[S] —C=CH
Using 'Sequence Rules' choose the correct order of priority of the groups?
(A)   Q > P > S > R
(B) P > Q > R > S
(C) Q > P > R > S
(D) P > Q > S > R

Q.138  Which one is an example of a bulk property detector used in HPLC?
(A)   Fluorescence detector    (B)   Photo diode array detector
(C)   Refractive index detector    (D)   UV detector

Q.139  A 250 jig/ml solution of a drug gave an absorbance of 0.500 at 250 nm at a path length of 10 mm. What is the specific absorbance of the drug at 250 nm?
(A)   0.002 cm-1gm-1litre    (B)   0.002 cm-1gm-1 dl
(C)   20 cm-1gm-1 litre    (D)   20 cm1gm-1dl

Q.140  Following statements are given for a chemical reaction:
Change in Gibb's free energy of the reaction has a negative value. Change in Enthalpy of the reaction has a negative value Change in Entropy of the reaction has a positive value Based on the above statements choose the correct answer.
(A)    The reaction is spontaneous.
(B)    The reaction is non-spontaneous.
(C)    The reaction could either be spontaneous or non-spontaneous.
(D)    The reaction can never be spontaneous.

Q. 141  Which of the following statements is WRONG?
(A)    The energy required for removing an electron from a molecule varies in the given order : lone pair < conjugated n < non conjugated n < a
(B)    Isotopic ratio is particularly useful for the detection and estimation of number of S, CI and Br atoms in the compound in MS
(C)    Neutral fragments and molecules do not get detected in the detector in MS
(D)    The most intense peak in the MS is called the molecular ion peak

Q.142   The protons ortho to the nitro group in p-nitrotoluene are examples of which one of the following types?
(A)    Chemically equivalent but magnetically non-equivalent protons
(B)    Chemically and magnetically equivalent protons
(C)    Chemically and magnetically nonequivalent protons
(D)    Chemically nonequivalent but magnetically equivalent protons

Q.143  The peak at m/z 91 in the mass spectrum for alkylbenzenes is due to which one of the followings?
(A)   Alpha fission                                    (B)   Mc-Laffartey rearrangement
(C)   Retro Diels-Alder rearrangement    (D)   Tropylium ion formation

Q.144  Which one of the followings is NOT bioisostearic pair
(A) Divalent ether (-0-) and amine (–N-H)  
(B) Hydroxyl (-OH) and thiol (-SH)
(C)   Carboxylate (C02-) and sulfone (SO2)
(D)    Hydrogen (-H) and fluorine (-F)

Q.145 The catalytic triad in acetylcholineesfcera«e is composed of which of the following amino acid residues?
(A)   Serine, Histidine and Glutamate             (B)   Serine, Arginine and Glutamate
(C)   Threonine, Histidine and Aspartate        (D)   Threonine, Arginine and Glutamate

Q.146  Which of the following statements is true?
(A)    Aliphatic protons have chemical shifts > 7 ppm
(B)    Spin quantum number of proton  is 1
(C)    Chemical shift describes electronic environment of a proton
(D)    Vicinal coupling constant is always higher than geminal coupling constant

Q.147   (3-Carboline ring system is present in
(A)   Emetine                (B)   Riboflavine
(C)   Deserpidine        (D)   d-Tubocurarine

Q.148   Of the four stereoisomers of chloramphenicol which one is the biologically active isomer?
(A)   L-Erythro    (B)   L-Threo    (C)   D-Erythro    (D)   D-Threo

Q.149 Fajan's method of titrimetric analysis involves detection of the end point on the basis of which one the followings?
(A)   Colour change                   (B)   Appearance of a precipitate
(C)   Neutralization reaction    (D)   Adsorption phenomenon

Q.150 In FT-IR instruments Michaelson interferometer is used in place of grating. The function of the interferometer is to act as a modulator'. What do you understand by this statement?
(A)    The function of the interferometer is to act as a monochromator
(B)    The function of the interferometer is to convert high frequency radiations into low ones
(C)    The function of the interferometer is to convert low frequency radiations into high ones
(D)    The function of the interferometer is to convert frequency domain spectra into time domain spectra