PUC Science 2nd PUC Class 12 - Karnataka Board PUC Important Questions

Write the structures of A, B, C, D and E in the following reactions:

What is the basicity of H₃PO₄?

Name the reagents used in the following reactions:

How do you convert the following : Propan-2-ol to 2-methylpropan-2-ol

Write the mechanism of the following reaction :

Write the equation involved in the acetylation of Salicylic acid.

Account for the following :

Acidic character increases from HF to HI.

Account for the following : There is large difference between the melting and boiling points of oxygen and sulphur.

Draw the structures of the following : ClF₃

Which allotrope of phosphorus is more reactive and why?

How the supersonic jet aeroplanes are responsible for the depletion of ozone layers?

F₂ has lower bond dissociation enthalpy than Cl₂. Why?

Which noble gas is used in filling balloons for meteorological observations?

Complete the equation :​ XeF₂+PF₅ →

Give reasons for the following : Oxygen has less electron gain enthalpy with negative sign than sulphur.

Give reasons for the following : H₃PO₂ is a stronger reducing agent than H₃PO₃.

Which halogen compound in the following pair will react faster in S_N2 reaction CH₃Br or CH₃I.

Which halogen compound in each of the following pairs will react faster in S_N2 reaction

(CH₃)₃ C – Cl or CH₃ – Cl

Draw the structure of the following:

H₂SO₄

What is meant by hydroboration-oxidation reaction? Illustrate it with an example.