FREE PG TRB CHEMISTRY ONLINE TEST

MARAN ACADEMY

PG TRB CHEMISTRY

  

 

1. .
   Sharpless asymmetric epoxidation is an example of _______.
   
   1.   Regioselectivity
   2.   Enantioselectivity
   3.   Diastereoselectivity
   4.   Chemoselectivity
2. Which one of the following is an example for umpolung reagent
   1.   1,3 – dithiane
   2.   LDA
   3.   Me3Si I
   4.   B2H6
3. The two reactions involved in the Robinson annulations are
   1.   Hydroboration and oxidation
   2.   Perkin reaction and Michael addition
   3.   Michael reaction and Aldol condensation
   4.   Oppenauer oxidation and MPV reaction
4. An optically active synthon is called as
   1.   Chiron
   2.   Assymmetric syntyhon
   3.   Retron
   4.   Dissymmetric synthon
5. Retro means
   1.   Splitting down
   2.   Going back
   3.   Synthetic method
   4.   Analysis
6. Sulphonation of naphthalene at 80ºC using conc. H2SO4 Gives mainly naphthalene – 1 –sulphonic acid . This is an example of
   1.   Product selectivity
   2.   Regioselectivity
   3.   Chemoselectivity
   4.   Stereoselectivity
7. Alcohol could be protected using
   1.   PhCOCl
   2.   AC2O
   3.   both (a) and (b)
   4.   ammonia
8. Generally a keto group is protected by using
   1.   an alcohol
   2.   acetic anhydride
   3.   Glycol
   4.   acetyl chloride
9. The reaction involving dipole inversion is called
   1.   umpolung reaction
   2.   Robinson reaction
   3.   Enantioselective reaction
   4.   Regioselecltivity
10. Which one of the following is used as a catalyst in homogeneous hydrogenation reactions?
    
    1.   CO2(CO)2
    2.   Pcl/BaSO4
    3.   Rhcl(PPh3)3
    4.   [Ti(H2o)6]3-
11. The energy difference between actual mass of an atom and its nuclear components is
    1.   Mass effect
    2.   Binding energy
    3.   Stellar energy
    4.   Nuclear energy
12. The stability of nucleus depends on
    1.   No of neutrons
    2.   No of protons
    3.   Neutron/proton ratio
    4.   proton/neutron ratio
13. In terms of Kg,1 amu is equal to
    1.   1.66x10-27kg
    2.   16.6 kg
    3.   160.0 kg
    4.   0.166x10-27kg
14. Which of the following nuclei is unstable ?
    1.   B10
    2.   N14
    3.   Be10
    4.   O16
15. The size of nucleus is of the order
    1.   10-8 cm
    2.   10-12 cm
    3.   10-15 cm
    4.   10-14 cm
16. The forces which holds the protons and neutrons together are called
    1.   Nuclear forces
    2.   Atomic forces
    3.   Molecular forces
    4.   Attractive forces
17. .
    When an α particles is ejected from the nucleus of an element,the nucleus of the product has
    1.   Two protons less
    2.   Two neutrons less
    3.   Two protons and two neutron less
    4.   All of these
18. The number of electrons in the nucleus of 17Cl 37 is
    1.   37
    2.   17
    3.   20
    4.   0
19. When an α-particle is ejected from the nucleus ,then the daughter nucleus has
    
    1.   two protons less
    2.   two protons + two electrons less
    3.   no change
    4.   two protons + two neutrons less