Science (English Medium) इयत्ता १२ - CBSE Important Questions for Chemistry

Write the mechanism of the following reaction : 

\[\ce{C2H5OH->[H2SO4][443K]CH2=CH2 + H2O}\]

Account for the following : 
t-butyl chloride on heating with sodium methoxide gives 2-methylpropene instead of t-butyl methyl ether.

Answer the following question.
Write the disproportionation reaction of H₃PO₃. 

Draw the structure of XeF₄. 

Account for the following : 
Although Fluorine has less negative electron gain enthalpy yet F₂ is a strong oxidizing agent.

Account for the following : 
Acidic character decreases from N₂O₃ to Bi₂O₃ in group 15.

Answer the following question.
Write a chemical reaction to test sulphur dioxide gas. write a chemical equation involved.

Write the chemical equation involved in the following reactions:

Acetylation of salicylic add

Give a simple chemical test to distinguish between the following pair of compounds:

Ethanal and Propanal

A compound 'A' of molecular formula C₂H₃OCl undergoes a series of reactions as shown below. Write the structures of A, B, C and D in the following reactions :

Distinguish between the following : Benzoic acid and methyl benzoate

Write the structure of 2-methylbutanal.

Write the structures of the main products when acetone (CH₃ − CO − CH₃) reacts with the following reagent :

Zn − Hg/conc. HCl

Write the structures of the main products when acetone (CH₃ − CO − CH₃) reacts with the following reagent :

H₂N − NHCONH₂/H⁺

Arrange the following in the increasing order of their boiling points : C₂H₅OH, CH₃ − CHO, CH₃ − COOH

Give a simple chemical test to distinguish between the following pair of compounds :

CH₃CH₂CHO and CH₃CH₂COCH₃

How will you bring about the following conversion?

Benzoyl chloride to benzaldehyde.

Describe the following:

Cannizzaro reaction

Complete the synthesis by giving missing starting material, reagent or product.

How do you convert the following:

Acetic acid to Methane