Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

The melting points and solubility in water of amino acids are generally higher than those of the corresponding halo acids. Explain.

What are non-essential amino acids? Give two examples.

Account for the following:

Although the amino group is o, p-directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

Write short notes on acetylation.

Give the IUPAC name of the following compound:

PhCH₂CH₂COOH

Give the IUPAC name of the following compound:

(CH₃)₂C=CHCOOH

Give the IUPAC name of the following compound:

Give the IUPAC name of the following compound:

How the following conversion can be carried out?

Benzene to 4-bromonitrobenzene

Complete the following reactions: C₂H₄ + O₂ →

Complete the following reactions:  4Al + 3O₂ →

Why is dioxygen a gas but sulphur a solid?

Why do noble gases have comparatively large atomic sizes?

Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.

Out of PbS and PbCO₃ (ores of lead), which one is concentrated by froth floatation process preferably?

Why are low spin tetrahedral complexes rarely observed?

Complete the following equations:

`2MnO_4^(-)+16H^++5S^(2-)rarr`

CO (g) and H₂ (g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?

How do you convert toluene to benzoic acid?

How do you convert the following :

 Ethyne to Ethanal