PG TRB online exam chemistry

MARAN ACADEMY

Quiz

  

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1. Best Source of Vitamin B-6?
   1.   Chickpeas
   2.   Tuna
   3.   whole grains
   4.   All of the above
2. Deficiency of Vitamin A causes
   1.   Poor Eye Health
   2.   Premature Skin Damage
   3.   Respiratory Infection
   4.   All of the above
3. Deficiency of Vitamin C causes
   1.   Back Pain
   2.   Night Blindness
   3.   Muscle Pain
   4.   Scurvy
4. Vitamin B-1 called.
   1.   Niacin
   2.   Thiamine
   3.   Riboflavin
   4.   Rationol
5. . Vitamin B-2 called.
   1.   Niacin
   2.   Thiamine
   3.   Riboflavin
   4.   Rationol
6. Vitamin B-12 (cyanocobalmin) is available in
   
   1.   Meat
   2.   Liver
   3.   Animal Products
   4.   All of the above
7. .
   Which one of the following is a bicyclic monoterpene
   
   1.   α- Pinene
   2.   Zingiberene
   3.   Menthol
   4.   Squalene
8. Which one of the following is a Sesquiterpene
   1.   Menthol
   2.   Zingiberene
   3.   α- Pinene
   4.   Squalene
9. A terpenoid used in the manufacture of celluloid and also as a moth repellent is
   1.   Squalene
   2.   Zingiberene
   3.   Camphor
   4.   α- Pinene
10. Which one of the following terpene is used in paint and varnishes as a thinner?
    1.   α- Pinene
    2.   Zingiberene
    3.   Menthol
    4.   Squalene
11. .
    In Friedel-Crafts acylation reactions, multiple acylations do not occur because the
    
    resulting compound __________________ the product
    1.   deactivates
    2.   neutralizes
    3.   activates
    4.   sterilizes
12. Which of the following is not associated with electrophilic aromatic substitution?
    
    1.   The formation of nitrobenzene
    2.   The formation of benzyne
    3.   The formation of bromobenzene
    4.   The formation of benzene sulfonic acid
13. When considering electrophilic aromatic substitution reactions electron donating
    subsituents (e.g. methoxy) are described as:
    1.   Ortho/para directing and activating
    2.   Ortho/para directing and deactivating
    3.   Meta directing and activating
    4.   Meta directing and deactivating
14. Which statement about the reaction of benzene with Cl2 in the presence of AlCl3 is incorrect?
    1.   AlCl3 is a catalyst
    2.   The mechanism is electrophilic addition.
    3.   Chlorobenzene is formed
    4.   The mechanism goes via an intermediate cation
15. . Which of the following is the most likely to be the pKa value of phenol?
    1.   9.89
    2.   16.00
    3.   4.77
    4.   2.30
16. An NH2 substituent in an aromatic ring is:
    1.   deactivating, and ortho- and para-directing
    2.   activating, and meta-directing.
    3.   activating, and ortho- and para-directing
    4.   deactivating, and meta-directing
17. 
    A nitro group will direct an incoming electrophile to ____________ position.
    
    1.   para
    2.   meta
    3.   ortho
    4.   ortho-para
18. Only one benzene ring is present in compounds of
    1.   aryl
    2.   acryl
    3.   ketone
    4.   carboxylic
19. The most reactive substrate toward nitration is
    
    1.   Benzene
    2.   Toluene
    3.   Acetophenone
    4.   Bromo benzene
20. An example of weak electrophile is
    1.   Diazonium ion
    2.   Sulphur trioxde
    3.   Halide ion
    4.   Acylcation