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Which of the following contributes to th...

Which of the following contributes to the double helical structure of DNA

A

hydrogen bond

B

covalent bond

C

disulphide bond

D

van-der Waal's force

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2009-Multiple Choice Questions (Chemistry)
  1. The addition of HBr to 2-pentene gives

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  2. Elthelene can be separated from acetylene by passing the mixture throu...

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  3. Reaction of R OH with R'MgX produces

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  4. In the compound HC -= C- overset(overset(CH(3))(|))(C )=CH(2) the hybr...

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  5. The two structures written below represent

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  6. Which of the following carbocations will be most stable?

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  7. Which statement is incorrect?

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  8. In which of the following reactions new carbon-carbon bond is not form...

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  9. A compound is formed by substitution of two chlorine for two hydrogens...

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  10. Which one of the following is called a carbylamine/

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  11. For making distinction between 2-pentanone and 3-pentanone the reagent...

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  12. Which one of the following formulae does not represent an organic comp...

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  13. The catalyst used for olefin polymerization is

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  14. The oxidant which is used as an antiseptic is

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  15. Which of the following contributes to the double helical structure of ...

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  16. The monomer used to produce orlon is

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  17. 1 mole of photon, each of frequency 2500S^(-1), would have approximate...

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  18. If n(t) number of radioatoms are present at time t, the following expr...

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  19. The following graph shows how T(1//2) (half-life) of a reactant R chan...

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  20. The second law of thermodynamics says that in a cylic process:

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