Question
Explain: On cutting some fruits and vegetables turn brown.
✓
Answer
i. Cutting of fruits and vegetables damage the cells, resulting in release of chemicals.
ii. Depending on the pH of fruits/vegetables, polyphenols are released.
iii. Due to the action of an enzyme, these polyphenols react with oxygen present in the air and get oxidised to form quinones.
ii. Depending on the pH of fruits/vegetables, polyphenols are released.
iii. Due to the action of an enzyme, these polyphenols react with oxygen present in the air and get oxidised to form quinones.
iv. Quinones further undergo reactions including polymerization, which results in the formation of brown coloured products called as tannins.
Thus, on cutting, some fruits and vegetables turn brown.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
a. Name the reactive intermediae produced
b. Indicate the movement of electrons by suitable arrow to produce this intermediate
c. Comment on stability of this intermediate produced.
The half-life of $^{209}Po$ is $102 y$. How much of $1$ mg sample of polonium decays in $62 y?$
→Cu forms coloured salts while Zn forms colourless salts.
Explain resonance with respect to $\mathrm{CO}_3^{2-}$ ion.
→Explain dehydration reaction of alcohols.
How much $CaO$ will be produced by decomposition of $5 g \ CaCO_3?$
→Explain the following terms with respect to precise measurement:
i. Absolute deviation
ii. Mean absolute deviation
iii. Relative deviation
i. Absolute deviation
ii. Mean absolute deviation
iii. Relative deviation
Give reasons for need of Hybridisation.
List the characteristic physical properties of the gases.
But$-1-$ene and $2-$methylpropene are separately treated with following reagents. Predict the product/products. Indicate major/minor product,
$i. HBr$
$ii. H_2SO_4 / H_2O$
→$i. HBr$
$ii. H_2SO_4 / H_2O$