Single Choice

$$Ka_{2}$$ of Maleic acid is lesser than $$Ka_{2}$$ of fumaric acid due to:

AIntramolecular hydrogen bonding in the ion formed after one proton removal in fumaric acid
BIntramolecular hydrogen bonding in the ion formed after one proton removal in maleic acid
Correct Answer
CIntermolecular hydrogen bonding in the ion formed after one proton removal in maleic acid
DIntermolecular hydrogen bonding in the ion formed after one proton removal in fumaric acid

Solution

Since after deprotonating the first time, maleic acid forms a stable anion, while fumaric acid cannot, $${ Ka }_{ 1 }$$of maleic is higher than of fumaric. For the same reason, $${ Ka }_{ 2 }$$ of fumaric acid is higher than of maleic. When maleic acid loses hydrogen ion, then it forms a very strong intra-hydrogen bond so the acid is more stable and strong also. Also it contains two carboxyl groups on both sides so it is more stable while in fumaric acid, the carboxyl groups are at opposite ends. conclusion: hence the option (B) is correct.

SIMILAR QUESTIONS

Chemical Bonding

Strongest hydrogen bond is present in:

Chemical Bonding

In solid ammonia, each $${NH}_{3}$$ molecule has six other $${NH}_{3}$$ molecules as nearest neighbours. $$\Delta H$$ of sublimation of $${NH}_{3}$$ at the melting point is $$30.8kJ$$ $${ mol }^{ -1 }$$ and the estimated $$\Delta H$$ of sublimation in the absence of hydrogen bonding is $$14.4kJ$$ $${ mol }^{ -1 }$$. What is the strength of hydrogen bond in solid ammonia in $$kJ$$ $${ mol }^{ -1 }$$? Give your answer in nearest integer number.

Chemical Bonding

Arrange the following as stated. Increasing strength of hydrogen bonding (X-H-X). $$O,S,F,Cl,N$$

Chemical Bonding

Which of the following hydrogen bonds are strongest in vapour phase?

Chemical Bonding

Define hydrogen bond. Is it weaker or stronger than the Van der Waals forces?

Chemical Bonding

Which of the following has strongest bond?

Chemical Bonding

Hydrogen bonds are formed in many compounds e.g., $$H_2O, HF \ and \ NH_3$$. The boiling point of such compounds depends to a large extent on the strength of the hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of the above compounds is :

Chemical Bonding

Among NH3,H2O,HF and H2S which have the highest magnitude of hydrogen bonding?

Contact Details