List of top Chemistry Questions on Organic Chemistry asked in CBSE CLASS XII

N,N-diethylbenzenesulphonamide is insoluble in alkali. Give reason.

Define colligative property. Which colligative property is preferred for the molar mass determination of macromolecules?

The vapour pressures of A and B at 25°C are 75 mm Hg and 25 mm Hg, respectively. If A and B are mixed such that the mole fraction of A in the mixture is 0.4, then calculate the mole fraction of B in the vapour phase.

(a) What is peptide linkage?
(b) What type of bonds hold a DNA double helix together?
(c) Which one of the following is a polysaccharide?
(d) Give one example each for water-soluble vitamins and fat-soluble vitamins.

Write the mechanism of the following reaction: \[ \text{CH}_3\text{CH}_2\text{OH} \xrightarrow{H^+ \, 443\, \text{K}} \text{CH}_2 = \text{CH}_2 \]

Out of chlorobenzene and 2,4,6-trinitrochlorobenzene, which is more reactive towards nucleophilic substitution and why?

Draw the structures of major monohalo products in each of the following reactions: 


(b) Give reasons for the following:
(i) Grignard reagent should be prepared under anhydrous conditions.
(ii) Alkyl halides give alcohol with aqueous KOH whereas in the presence of alcoholic KOH, alkenes are formed