List of top Chemistry Questions on Reaction mechanisms asked in UP Board XII

Explain the mechanism of substitution reactions of Haloalkane.

Describe the method of preparation of potassium permanganate. How does acidic potassium permanganate react with the following? Give ionic equations: (i) H$_2$S  (ii) Fe  (iii) iodide ion.
 

Write the products of the following reactions:

A first order reaction completes 20% in 10 minutes. Calculate the time taken for 75% completion.
 

Methyl amine gives precipitate of hydrated ferric oxide on reaction with ferric chloride in water.
Aniline does not show Friedel-Crafts reaction.
What do you understand by these following terms? Give one example of each.
(i) Aldol (ii) Schiff's base (iii) Cannizaro's reaction (iv) Oxime (v) Acetal
Haloalkanes give nucleophilic substitution reactions while haloarenes give electrophilic substitution reactions.
Potassium cyanide gives alkyl cyanide on reaction with haloalkanes (R-X) while silver cyanide forms an isocyanide as main product.
In \( 2A \rightarrow \) Product, the reaction concentration of A remains 0.4 mol\(^{-1}\) from 0.5 mol\(^{-1}\) in 10 minutes.
Calculate the velocity of reaction for this period of time.
Differentiate between:
(x) Order of a reaction and molecularity
(y) Average and instantaneous velocity
What do you understand by order of a reaction? Calculate the total order of those reactions which have velocity equations:
(i) Velocity \( = K[A]^{1/2}[B]^{3/2} \)
(ii) Velocity \( = K[A]^3[B]^{-1} \)
Explain the following reactions with suitable chemical equations:
(i) Wurtz reaction
(ii) Wurtz-Fittig reaction
Reagent, which do not react with acetone and benzaldehyde:
What do you understand by dehydration reaction? Write the mechanism of dehydration reaction of alcohol.
How do the following factors affect the velocity of reaction? (i) Concentration
(ii) Temperature
(iii) Catalyst
Explain Cannizzaro reaction with chemical equation.
Best method of preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is
Potassium cyanide gives alkyl cyanide on reaction with haloalkanes (R-X) while silver cyanide forms an isocyanide as main product.
Haloalkanes give nucleophilic substitution reactions while haloarenes give electrophilic substitution reactions.
Explain the mechanism of the reaction of diethyl ether with HI.
Explain the mechanism of dehydration of alcohol.
Write notes on the following: Mechanism of esterification of carboxylic acid:
Discuss the mechanism of unimolecular nucleophilic substitution reaction (\( S_N1 \)) in haloalkanes.

Write two characteristic properties of transition metals.