🧪 Organic Reactions — Practice Worksheet

Q1. The IUPAC name of CH₃CH(OH)CH₃ is:

1. 1-Propanol
2. 2-Propanol
3. Propan-1-ol
4. Isopropyl alcohol

Q2. Markovnikov's rule is applicable to the addition of HBr to:

1. Ethene
2. Propene
3. Ethyne
4. Methane

Q3. The product of Wurtz reaction between CH₃Br and C₂H₅Br (with Na) includes:

1. Only propane
2. Ethane, propane, and butane
3. Only ethane and butane
4. Only butane

Q4. Which reagent is used in the Friedel-Crafts alkylation?

1. AlCl₃
2. FeCl₃
3. ZnCl₂
4. BF₃

Q5. The reaction of toluene with KMnO₄ gives:

1. Benzyl alcohol
2. Benzaldehyde
3. Benzoic acid
4. Phenol

Q6. SN1 reaction proceeds through:

1. Carbanion intermediate
2. Carbocation intermediate
3. Free radical intermediate
4. Concerted mechanism

Q7. The order of reactivity of alkyl halides in SN2 reactions is:

1. 3° > 2° > 1° > CH₃X
2. CH₃X > 1° > 2° > 3°
3. 1° > 2° > 3° > CH₃X
4. 2° > 1° > 3° > CH₃X

Q8. Grignard reagent (RMgX) reacts with formaldehyde to give:

1. Primary alcohol
2. Secondary alcohol
3. Tertiary alcohol
4. Aldehyde

Q9. The product of aldol condensation of acetaldehyde is:

1. Acetone
2. 3-Hydroxybutanal
3. Butanal
4. Acetic acid

Q10. Which of the following undergoes Cannizzaro reaction?

1. Acetaldehyde
2. Formaldehyde
3. Acetone
4. Propanal

Q11. Dehydration of ethanol with concentrated H₂SO₄ at 170°C gives:

1. Ethane
2. Ethene
3. Diethyl ether
4. Acetaldehyde

Q12. The Kolbe reaction involves the treatment of sodium phenoxide with:

1. CO₂ under pressure
2. CHCl₃ + NaOH
3. CH₃Cl + AlCl₃
4. HNO₃

Q13. Which test distinguishes between aldehydes and ketones?

1. Tollen's test
2. Lucas test
3. Lassaigne's test
4. Beilstein test

Q14. The product of Clemmensen reduction of acetophenone is:

1. 1-Phenylethanol
2. Ethylbenzene
3. Styrene
4. Benzaldehyde

Q15. Aniline reacts with bromine water to give:

1. o-Bromoaniline
2. p-Bromoaniline
3. 2,4,6-Tribromoaniline
4. m-Bromoaniline

Q16. The Hofmann bromamide reaction converts an amide to:

1. An amine with one more carbon
2. An amine with one less carbon
3. A nitrile
4. An isocyanate only

Q17. Which of the following is the strongest acid?

1. CH₃COOH
2. ClCH₂COOH
3. Cl₂CHCOOH
4. Cl₃CCOOH

Q18. Ozonolysis of 2-butene gives:

1. Two moles of formaldehyde
2. Two moles of acetaldehyde
3. One mole each of formaldehyde and acetaldehyde
4. One mole of acetone and one mole of formaldehyde

Q19. Write the mechanism of SN1 reaction of tert-butyl bromide with water. Identify the rate-determining step.

Q20. Predict the major product when HBr is added to propene (a) without peroxide, (b) with peroxide (anti-Markovnikov). Explain the difference.

Q21. An organic compound A (C₃H₆O) gives a positive iodoform test and does not reduce Tollen's reagent. Identify A and write the iodoform reaction.

Q22. Convert: (a) Ethanol to ethanoic acid (b) Benzene to acetophenone. Write reagents and conditions for each step.

Q23. Arrange the following in decreasing order of basic strength: CH₃NH₂, (CH₃)₂NH, C₆H₅NH₂, NH₃. Give reasons.

Q24. Write the products of the reaction of phenol with (a) dilute HNO₃, (b) bromine water, (c) Zn dust. Name each reaction type.

Q25. An organic compound with molecular formula C₄H₈O₂ on hydrolysis with NaOH gives a sodium salt and an alcohol. The alcohol gives iodoform test. Identify the compound and write the hydrolysis reaction.

Q26. Explain why vinyl chloride (CH₂=CHCl) is less reactive than ethyl chloride (C₂H₅Cl) towards nucleophilic substitution.

Q27. Write the Reimer-Tiemann reaction of phenol. What is the product and what conditions are required?

Q28. Give the products of the following reactions: (a) CH₃CHO + HCN → ? (b) Product of (a) + H₃O⁺ → ? Identify the final product.

Q29. Compound X (C₂H₅Br) is treated with alcoholic KOH to give Y, which on treatment with HBr in the presence of peroxide gives Z. Identify X, Y, Z and write all reactions.

Q30. Explain the directing effects of —OH and —NO₂ groups in electrophilic aromatic substitution. Why is —OH ortho/para directing while —NO₂ is meta directing?