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Class 12 Alcohols, Phenols and Ethers worksheet
CBSE Chemistry. Naming, Lucas test, oxidation and dehydration, acidity of phenols, Williamson synthesis, ether cleavage. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Alcohols have higher boiling points than ethers of similar mass because of:
- ionic bonding
- lower molar mass
- van der Waals forces only
- hydrogen bonding
Answer
(d) hydrogen bonding
- 2.
The IUPAC name of (CH₃)₂CHOH is:
- propan-2-ol
- butan-2-ol
- 2-methylpropan-2-ol
- 2-methylpropan-1-ol
Answer
(a) propan-2-ol
the longest chain containing the –OH carbon; –ol ending
- 3.
Which alcohol gives turbidity at once with the Lucas reagent?
- propan-1-ol
- butan-1-ol
- ethanol
- 2-methylpropan-2-ol
Answer
(d) 2-methylpropan-2-ol
2-methylpropan-2-ol is a tertiary (3°) alcohol
Section B · short answer
- 4.
Why is phenol acidic? Why is 4-nitrophenol more acidic than phenol?
Answer
The phenoxide ion formed by losing H⁺ is stabilised by resonance over the ring. A nitro group at the para position withdraws electrons and spreads the negative charge further, stabilising the ion even more.
- 5.
What is the main product when cyclohexanol is heated with concentrated H₂SO₄? Which alcohols dehydrate most easily?
Answer
cyclohexene; tertiary > secondary > primary
acid-catalysed dehydration through a carbocation
Section C · long answer
- 6.
Describe three methods of preparing alcohols, with equations.
Answer
From alkenes by acid-catalysed hydration (Markovnikov): CH₃CH=CH₂ + H₂O → CH₃CH(OH)CH₃. By hydroboration–oxidation (anti-Markovnikov): propene → propan-1-ol. From carbonyl compounds by reduction (H₂/Pd, NaBH₄, LiAlH₄) or with Grignard reagents: HCHO gives a 1° alcohol, other aldehydes 2°, ketones 3°.
Fresh sheets for your child
In the app, every Alcohols, Phenols and Ethers sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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