Solutions — Chemistry STD 12 Science — Question

Answer the following:
(a) For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?
(b) State a condition under which a bimolecular reaction is kinetically first-order reaction.

Give reasons for the following observations:

The treatment of alkyl chloride with aqueous KOH leads to the formation of alcohol but in the presence of alcoholic KOH, alkene is the major product.

How will you perform following conversion?

In a reaction if the concentration of reactant A is tripled, the rate of reaction becomes twenty seven times. What is the order of the reaction?

To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate your answer with examples.

In a reaction between A and B, the initial rate of reaction (r₀) was measured for different initial concentrations of A and B as given below:

A/mol L-1	0.20	0.20	0.40
B/mol L-1	0.30	0.10	0.05
r0/mol L-1 s-1	5.07 × 10-5	5.07 × 10-5	1.43 × 10-4

What is the order of the reaction with respect to A and B?

Accomplish the following conversion:
Aniline to 2, 4, 6 -tribromofluorobenzene.

Explain what is meant by the following:

1. Peptide linkage.
2. Pyranose structure of glucose.

Arrange the compound of set in order of reactivity toward S_N2 displacement :
2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane.

Answer the following questions:
Illustrate the following reactions:

1. Hoffmann bromamide degradation reaction.
2. Coupling reaction.