Question

Orfer of acidic strength of mallic acid and fumeric acid

Answer 1

Answer:

Explanation:

Mallic acid is cis-butenedioic acid whereas fumeric acid is trans-butenedioic acid.

Mallic acid is able to lose  ion and it results in the formation of intra-hydrogen bond. Whereas fumeric acid being a trans isomer has strong interaction with both the oxygen atoms of each carboxylic group.

Hence, fumeric acid is unable to give hydrogen ions as compared to mallic acid.

That is why, mallic acid is a stronger acid than fumeric acid.

Answer 2

Maleic acid or cis- butenedioic acid, being a cis- isomer is capable of forming intra-hydrogen bond after losing H+ ion, making the conjugate Base (negative ion) much stable than the trans form (Fumaric acid) because both the oxygen atoms have strong interaction with the remaining H atom.