Previous year questions with solutions · 2024 – 2026
| Year | Questions | Papers | Avg / paper | Weightage |
|---|---|---|---|---|
| 2026 | 9 | 19 | 0.47 | 1.89% ▲ 12.5% vs last year |
| 2025 | 8 | 19 | 0.42 | 1.68% ▼ 36.7% vs last year |
| 2024 | 16 | 21 | 0.76 | 2.66% |
Consider the isomers of hydrocarbon with molecular formula C5H10. These isomers do not decolourise KMnO4 solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is .
Consider all the structural isomers with molecular formula C5H11Br are separately treated with KOH(aq) to give respective substitution products, without any rearrangement. The number of products which can exhibit optical isomerism from these is .
The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula C9H12 is .
The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is .
The number of optical isomers in following compound is : . [figure]
The number of optically active compounds from the following is . [figure] CH3-CH2-CH2-CH2-OH, CH3-CH2- Cl |CH-CH3, CH3-CH2-CH2-CH2-Cl, (CH3)2CH-CH2-CH2-Cl
Number of optical isomers possible for 2-chlorobutane .
Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is .
Number of geometrical isomers possible for the given structure is/are . [figure]
2-chlorobutane + Cl2 C4H8Cl2 (isomers) Total number of optically active isomers shown by C4H8Cl2, obtained in the above reaction is .
3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for 'A' is .
Total number of compounds with Chiral carbon atoms from following is . [figure] CH3-CH2-CH(NO2)-COOH CH3-CH2-CHBr-CH2-CH3 CH3-CH(I)-CH2-NO2 CH3-CH2-CH(OH)-CH2OH CH3- I |CH-CH(I)-C2H5