Top 30 MHT CET PYQs on Alcohol, Phenol & Ether
With Detailed Solutions
Frequently asked chapter — master karo ek baar, exam mein aayega zaroor! ✅ Free MCQs | Concept Explanations | PDF Download
📌 Introduction — Ye Chapter Kyun Important Hai?
Agar aap MHT CET 2026 ki taiyari kar rahe hain, toh Alcohols, Phenols, and Ethers ek aisa chapter hai jise kabhi ignore nahi karna chahiye. Yeh chapter Class 12 ke Organic Chemistry ka ek core topic hai, aur MHT CET ke syllabus mein iska weightage consistently high raha hai.
Is chapter mein se naming reactions, identification tests (Lucas test, FeCl₃ test), acidity comparisons, aur mechanism-based questions bahut baar aaye hain. Agar aapne PYQs solve kiye hain, toh aap easily predict kar sakte ho ki paper mein kaunse type ke questions aayenge.
Previous Year Questions (PYQs) kyun solve karne chahiye? Kyunki MHT CET ke questions mostly ek specific pattern follow karte hain — concepts repeat hote hain, sirf values ya compounds change hote hain. PYQs solve karne se aapki speed increase hoti hai, accuracy badhti hai, aur exam anxiety kam hoti hai. Yahi Exam Buzz Now ka mission hai — aapko smart study kara ke best results dilana! 💪
📚 Key Topics — Kya-Kya Padna Hai?
MHT CET ke liye yeh sub-topics specially focus karo:
🎯 MHT CET Previous Year MCQs — With Solutions
Which alcohol gives an immediate turbidity with Lucas reagent (anhydrous ZnCl₂ + conc. HCl) at room temperature?
Phenol gives a characteristic colour with neutral FeCl₃ solution. What is the colour produced?
Which of the following has the highest boiling point among compounds with similar molecular weight?
Reaction of phenol with dilute HNO₃ at room temperature gives which product(s)?
Arrange the following in increasing order of acidity: Ethanol, Phenol, Carbonic acid (H₂CO₃), Water
When ethanol is heated with excess conc. H₂SO₄ at 170°C, the product formed is:
• 140°C + conc. H₂SO₄ + excess alcohol → Diethyl ether (dehydration of 2 molecules)
• 170°C + conc. H₂SO₄ → Ethylene (intramolecular dehydration, E2 mechanism)
High temperature favors alkene formation — Saytzeff's rule bhi yahan applicable hai! 🌡️
In Kolbe's synthesis, sodium phenoxide reacts with CO₂ under pressure at 125°C to give:
The Reimer-Tiemann reaction of phenol with CHCl₃ and NaOH gives:
In Victor Meyer's test, which alcohol gives a blood-red colour with the nitrous acid treatment followed by FeCl₃?
• 1° alcohol → Nitrolic acid → Blood Red with FeCl₃
• 2° alcohol → Pseudonitrole → Blue
• 3° alcohol → No reaction (no H on α-carbon) → Colourless
Trick: 1-Red, 2-Blue, 3-No hue! 🎨
What is the product when diethyl ether reacts with excess HI?
The IUPAC name of the compound CH₃–CH(OH)–CH₂–CH₃ is:
Which of the following alcohols does NOT get oxidized by acidic KMnO₄ or K₂Cr₂O₇ under normal conditions?
• 1° alcohol → Aldehyde → Carboxylic acid (with excess oxidizing agent)
• 2° alcohol → Ketone
• 3° alcohol → No oxidation (no H on α-carbon attached to OH bearing carbon — no β-H for E2)
Tertiary alcohol mein α-carbon pe hydrogen nahi hota, isliye oxidation possible nahi. Simple test: Agar orange K₂Cr₂O₇ green nahi hota = tertiary alcohol! 🟢
When phenol reacts with bromine water (Br₂/H₂O), the product formed is:
Methanol is also known as wood spirit. It is used as:
Phenol reacts with NaOH solution but NOT with NaHCO₃. This is because:
Which of the following correctly describes the C–O–C bond angle in diethyl ether?
Which of the following is a secondary alcohol with molecular formula C₄H₁₀O?
• Butan-1-ol → Primary (OH on C1)
• Butan-2-ol → Secondary (OH on C2, 2 alkyl groups attached)
• 2-methylpropan-1-ol → Primary (OH on terminal carbon)
• 2-methylpropan-2-ol → Tertiary (OH on C with 3 alkyl groups)
Tip: Type of alcohol = type of carbon carrying OH group! 🎯
Which method is best suited for preparation of unsymmetrical ethers?
Which of the following alcohols is completely miscible with water?
Ethylene glycol (ethan-1,2-diol) is used as an antifreeze agent in automobiles because:
📊 Most Repeated Questions — Trend Analysis
MHT CET 2018–2025 ke papers analyze karne ke baad yeh pattern saamne aaya hai:
| Topic / Question Type | Frequency | Years Seen | Action |
|---|---|---|---|
| Lucas Test (identification of 1°, 2°, 3° alcohols) | 🔥 Very High | 2019, 2021, 2022, 2023, 2024 | Must prepare |
| FeCl₃ Test for Phenol | 🔥 Very High | 2020, 2022, 2023, 2024 | Must prepare |
| Boiling Point comparison (alcohol vs ether vs alkane) | 🔥 High | 2019, 2021, 2023, 2024 | Must prepare |
| Phenol + HNO₃ (dilute vs conc.) | 🔥 High | 2020, 2021, 2022, 2023 | Must prepare |
| Victor Meyer Test colour codes | ⚡ Medium | 2019, 2021, 2022 | High priority |
| Kolbe's & Reimer-Tiemann reactions | ⚡ Medium | 2020, 2022, 2024 | High priority |
| IUPAC naming of alcohols | ⚡ Medium | 2021, 2022, 2023, 2024 | High priority |
| Williamson Synthesis | ⚡ Medium | 2020, 2023, 2024 | Important |
| Acidity order (Phenol vs Alcohol vs H₂CO₃) | 🔥 High | 2019, 2020, 2022, 2024 | Must prepare |
| Phenol + Br₂ water (tribromophenol) | ⚡ Medium | 2021, 2022, 2023 | Important |
| Dehydration (140°C vs 170°C) | ⚡ Medium | 2019, 2021, 2022 | Important |
| Ether + HI cleavage | ✅ Lower | 2020, 2021 | Cover if time |
⚡ Quick Revision Notes — Exam Se Pehle Zaroor Padho!
🧪 Identification Tests
- Lucas Test: 3° = Instant turbidity, 2° = 5 min, 1° = No reaction (or heating needed)
- FeCl₃ Test: Phenol = Violet/Purple colour
- Victor Meyer: 1° = Blood Red, 2° = Blue, 3° = Colourless
- Br₂ water: Phenol = White ppt (2,4,6-tribromophenol)
- Na metal: Alcohols + Na → H₂ gas (effervescence)
🌡️ Boiling Points (Key Facts)
- Alcohol > Ether (same mol. wt.) — H-bonding reason
- Phenol (182°C) > Benzyl alcohol (205°C) — ring structure effect
- o-Nitrophenol < p-Nitrophenol (intramolecular H-bond in ortho)
- Diol > Monohydric alcohol — more OH groups = more H-bonding
- Methanol (65°C) < Ethanol (78°C) < Propanol (97°C)
⚗️ Important Reactions
- Kolbe's: PhONa + CO₂ → Salicylic acid
- Reimer-Tiemann: Phenol + CHCl₃/NaOH → Salicylaldehyde
- Williamson: R–ONa + R'X → R–O–R' (unsym. ether)
- Dehydration 140°C → Ether; 170°C → Alkene
- Phenol + Conc. HNO₃ → Picric acid (2,4,6-TNP)
📐 Acidity & Basicity
- Acidity: Carboxylic acid > H₂CO₃ > Phenol > Water > Alcohol
- Phenol reacts with NaOH but NOT NaHCO₃
- Electron-withdrawing groups (–NO₂) increase phenol acidity
- Electron-donating groups (–CH₃) decrease phenol acidity
- p-nitrophenol more acidic than phenol
🧬 Oxidation Rules
- 1° alcohol → (mild oxidn.) Aldehyde → (strong oxidn.) Carboxylic acid
- 2° alcohol → Ketone only
- 3° alcohol → No oxidation with KMnO₄/K₂Cr₂O₇
- Methanol → Formaldehyde → Formic acid → CO₂ + H₂O
- Tollens/Fehling → tests for aldehyde (from 1° oxidn.)
🎯 MCQ Shortcuts / Tricks
- "Phenol = Purple" (FeCl₃ test) — both P!
- "1-Red, 2-Blue, 3-No hue" (Victor Meyer)
- "3° = Instant, 2° = Wait, 1° = Late" (Lucas test)
- Ether uses HI (not HBr/HCl) for cleavage most readily
- Phenol + dilute HNO₃ → o+p mixture; conc. → picric acid
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🏆 Exam Strategy — Smart Attempt Kaise Karo?
⏱️ Time Management — 2 Min Rule
Ek MCQ pe maximum 1.5–2 minutes lagao. Agar answer nahi aa raha toh skip karo aur baad mein aao. Chemistry ke 45 questions 45 minutes mein karne hain — per question sirf 1 minute! Organic Chemistry ke questions usually concept-based hote hain, isliye practice se speed badhti hai.
🧠 Elimination Method Use Karo
Agar directly answer nahi pata, toh galat options eliminate karo. Mostly ek ya do options clearly wrong hote hain. Elimination se 50–50 chance se better accuracy milti hai. Yeh technique especially naming questions aur reaction questions mein kaam aati hai.
⚠️ Common Mistakes — Avoid Karo
① Lucas test mein "primary alcohol reacts fastest" — GALAT! Tertiary fastest hai. ② FeCl₃ test: alcohol bhi violet deta hai — GALAT! Sirf phenol deta hai. ③ Phenol + NaHCO₃ react karta hai — GALAT! Phenol react nahi karta. ④ Ether ka BP alcohol se zyada hota hai — GALAT! Alcohol ka BP zyada hota hai.
📋 Pre-Exam Revision Checklist
Exam se 1 din pehle: identification tests ke colour codes, boiling point order, acidity order, dehydration temperatures (140°C/170°C), aur Williamson synthesis mechanism zaroor revise karo. Yeh 5 topics se akele 3–4 questions aane ki guarantee hai MHT CET mein!
✏️ Exam Hall Strategy
Pehle woh questions karo jo aapko 100% pata hain. Chemical reactions wale questions mein rough work karo — molecular formula likh ke confirm karo. Negative marking nahi hai MHT CET mein, toh koi bhi question blank mat chodo — educated guess zaroor lagao!
🔗 Related Chapters — Yeh Bhi Padho!
Tum Kar Sakte Ho! — You've Got This!
Alcohols, Phenols & Ethers ek aisa chapter hai jo practice se completely master kiya ja sakta hai. Ek baar identification tests, boiling point order, aur major reactions clear ho jaayein, toh is chapter ke 3–4 marks pakke hain exam mein! 💪
Rooz ek baar yeh PYQs revise karo, quick notes dekhte raho, aur upar diya hua PDF jaroor download karo. Exam Buzz Now hamesha aapke saath hai — smart study karo, hard work karo, aur MHT CET 2026 crack karo! 🚀
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👉 Full PDF — 30 Solved MCQs
Abhi WhatsApp par click karo aur free PDF instantly pao — Alcohol Phenol Ether ke 30 solved MCQs with detailed explanations, quick tricks aur formula sheet!
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