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Previous year questions with solutions · 2025 – 2026
| Year | Questions | Papers | Avg / paper | Weightage |
|---|---|---|---|---|
| 2026 | 24 | 19 | 1.3 | 5.05% ↓5.3% |
| 2025 | 16 | 12 | 1.3 | 5.33% |
'x' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. 'y' is the major product obtained from the benzene by reacting it with ethanoyl chloride in the presence of anhydrous AlCl3. Product (major) obtained by heating x and y in the presence of alkali is z. Total number of π (pi) electrons in z is .
Consider the following sequence of reactions to give the major product (X) [figure] P g of the major product (X) formed is reacted with NaHCO3 solution to liberate a gas which occupied 11.2 dm3 at STP. P = g. (Given molar mass in g mol-1 H : 1, C : 12, O : 16, Cl : 35.5)
Grignard reagent RMgBr (P) reacts with water and forms a gas (Q). One gram of Q occupies 1.4 dm3 at STP. (P) on reaction with dry ice in dry ether followed by H3O+ forms a compound (Z). 0.1 mole of (Z) will weigh g. (Nearest integer)
Consider the following reaction of benzene. [figure] In compound (Q), the percentage of oxygen is %. (Nearest integer)
[figure] 0.1 mole of compound 'S' will weigh g. (Given molar mass in g mol-1 C : 12, H : 1, O : 16)