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Assertion:- pKa(1) of fumaric acid is gr...

Assertion:- `pKa_(1)` of fumaric acid is greater than maleic acid.
Reason Conjugate base of fumaric acid is more stable due to intramolecular H-bonding.

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The correct Answer is:
After the first dissociation,, maleate ion is more stablised due to intramolecular H-bonding, whereas furnate ion does not have intramolecular H-bonding.
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ALLEN-ALKENE, ALKANE & ALKYNE -EXERCISE-4[A]
  1. A comopound has two isomers (A) and (B) of formula C(5)H(10)O. Isomer ...

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  2. Give reasons for the following : 'Carbon-oxygen bond lengths in form...

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  3. Assertion:- pKa(1) of fumaric acid is greater than maleic acid. Reas...

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  4. Which is stronger conjugate base in each pair ? (A) overset(-)OH or ...

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  5. Which acid of each pair shown here would you expect to be stronger? ...

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  6. What are A and B in the following ?

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  7. In the following reaction, trace the position of isotopic O^(18) CH(...

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  8. Write the reagents to carry out following conversions: CH(3)overset(...

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  10. What are X and Y ?

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  11. Write down the structure of A? What is the use of A ?

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  12. Arrange the following in decreasing basic order with proper reasoning.

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  13. Sulphanilic acid is a/an:

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  14. What is the order of basicity of the following compounds ? (i) CH(3)...

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  15. What is the order of basicity of the following compounds ? (i) CH(3)...

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  16. Unlike other aromatic amines, why is the following amine stongly basic...

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  17. In this compound which site acts as an acid and which as a base ?

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  18. Alkyl cyanides (CH(3)CN) when treated with hydrogen in presence of P...

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  19. Write the compound (A) and (B) formed in this

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  20. Identify the stronger base in each of the following pairs : (i) CH(3...

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