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AIPMT 2007 Chemistry Screening

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Q. 21. The order of decreasing reactivity towards an electrophilic reagent, for the following:

  1. Benzene
  2. Toluene
  3. Chlorobenzene
  4. Phenol would be

 

  1. d > b > a > c
  2. a > b > c > d
  3. b > d > a > c
  4. d > c > b > a

Sol. The correct order is d > b > a > c. Correct choice: (1)

Q. 22. Predict the product C obtained in the following reaction of

Sol.
Correct choice: (1)

Q. 23. Which of the compounds with molecular formulaC5H10 yields acetone on ozonolysis?

  1. 2 – Methyl – 1 – butene
  2. 2 – Methyl – 2 – butane
  3. 3 – Methyl – 1 – butane
  4. Cyclopentane

Sol.

Correct choice: (2)

Q. 24. If there is no rotation of plane polarized light by a compound in a specific solvent, thought to be chiral, it may mean that

  1. the compound may be a racemic mixture
  2. the compound is certainly a chiral
  3. the compound is certainly meso
  4. there is no compound in the solvent

Sol. The given compound was thought to be chiral because of a chiral carbon/s. If there is no optical activity, it means the compound must certainly be meso. Correct choice: (3)

Q. 25. For the following

  1. l–
  2. Cl –
  3. Br-

the increasing order of nucleophilicity would be:

Sol. The order of nucleophilicities of halides ions in water (default solvent) will be  Correct choice: (3)

Q. 26. has a chiral centre. Which one of the following represents its R configuration?

 

Sol.

Q. 27. In the reaction

Which of the following compounds will be formed?

Sol.
Correct choice: (1)

Q. 28. Which one of the following vitamins is water-soluble?

  1. Vitamin A
  2. Vitamin B
  3. Vitamin E
  4. Vitam in K

Sol. Vitamin (B) and vitamin (C) are water soluble, while Vitamin (A), (D), (E) and (K) are fat soluble. Correct choice: (2)

Q. 29. RNA and DNA are chiral molecules, their chirality is due to

  1. D – sugar component
  2. L – sugar component
  3. Chiral bases
  4. Chiral phosphate ester units

Sol. Deoxyribose and ribose sugars are D -chiral sugars in DNA and RNA. Correct choice: (1)

Q. 30. Which one of the following polymers is prepared by condensation polymerization?

  1. Styrene ]
  2. Nylon – 66
  3. Teflon
  4. Rubber

Sol. Nylon-66 is a condensation polymer of hexamethylene diamine and adipic acid. \Correct choice: (2)


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