Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Consider a certain reaction A → Products with k = 2.0 × 10^–2s^–1. Calculate the concentration of A remaining after 100 s if the initial concentration of A is 1.0 mol L^–1.

Discuss the method to determine electrode potential of copper and zine by using standard hydrogen electrode.

1. Describe the following giving suitable examples:

1. Cannizzaro reaction.
2. Aldol condensation.

2. ​​​​​​​Give a chemical test to distinguish between ethanal and propanal.

What is galvanic cell? Give half cell reaction of Daniell cell.

How would you account for the following:
There is a gradual decrease in the atomic sizes of transition elements in a series with increasing atomic numbers.

Answer the following question:
An organic compound A having molecular formula C₆H₆O gives a characteristic colour with aqueous FeCl₃ solution. A on treatment with CO₂ and NaOH at 400K under pressure gives B which on acidification gives a compound C. The compound C reacts with acetyl chloride to give D which is a popular pain killer. Deduce the structure of A, B, C and D.

How many mL of 0.1 M HCl are required to react completely with 1 g mixture of Na₂CO₃ and NaHCO₃ containing equimolar amounts of both?

For the complex [Fe(en)₂Cl₂]Cl, (en = ethylene diamine), identify.

1. The oxidation number of iron,
2. The hybrid orbitals and the shape of the complex,
3. The magnetic behaviour of the complex,
4. The number of geometrical isomers,
5. Whether there is an optical isomer also, And
6. Name of the complex. (At. no. of Fe = 26).