Alcohols, Phenols & Ethers: Class 12 Previous Year Questions

Alcohols, Phenols & Ethers questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. (A) An organic compound ‘A’, with molecular formula C2H6O reacts with active metals such as sodium to give compound ‘B’ and hydrogen gas. ‘A on treatment with iodine and sodium hydroxide gives ‘C’ and in presence of H2SO4 at 413 K gives ‘D’ (C4H10O). ‘D’ on re…
   Board 20265 markslong answer
2. Assertion (A) : The presence of –OH group in phenols directs the incoming group to meta position in the ring. 1 Reason (R) : –OH group in phenols activates the aromatic ring towards electrophilic substitution reaction.
   Board 20261 markAssertion-Reason
3. Like NH3, nitrogen atom of amine is trivalent and carries an unshared pair of electrons. Nitrogen orbitals in amines are therefore sp3 hybridised and the geometry of amines is pyramidal. Lower aliphatic amines are soluble in water due to the formation of hydro…
   Board 20264 marksshort answer
4. At low temperature, phenol reacts with dil. HNO3 to yield 1 (A) 2, 4, 6-Trinitrophenol (B) o-Nitrophenol only (C) p-Nitrophenol only (D) ortho-and para-nitrophenol
   Board 20261 markMCQ
5. (A) An organic compound ·A', molecular formula C,H.O oxidises with CrO, to form a compound ·B'. Compound 'B' on warming with iodine and aqueous solution of NaOH gives a yellow precipitate of compound C'. When compound 'A' is heated with conc. H,SO4 at 413 K gi…
   Board 20255 markslong answer
6. The conversion of phenol to salicylic acid can be accomplished by Reimer-Tiemann reaction (A) (B) Friedel-Crafts reaction (C)Kolbe reaction (D) Coupling reaction
   Board 20251 markMCQ
7. Phenols undergo electrophilic substitution reactions readily due to the strong activating effect of OH group attached to the benzene ring. Since, the OH group increases the electron density more to o- and p- positions therefore OH group is ortho, para-directin…
   Board 20254 marksshort answer
8. The best reagent for converting propanamide into propanamine is (A) excess H2 (B) Br, in aqueous NaOH (C) iodine in the presence of red phosphorus (D) LiA/H4 in ether
   Board 20251 markMCQ
9. Nucleotides are joined together by (A) Glycosidic linkage (B) Peptide linkage (C) Hydrogen bonding (D) Phosphodiester linkage
   Board 20251 markMCQ
10. The correct order of the ease of dehydration of the following alcohols by the action of conc. H2SO4 is : (A) (CH3)3C OH > (CH3)2CH OH > CH3CH2 OH (B) (CH3)2CH OH > CH3CH2 OH > (CH3)3C OH (C) CH3CH2 OH > (CH3)2CH OH > (CH3)3C OH (D) (CH3)2CH OH > (CH3)3C OH > C…
    Board 20241 markMCQ
11. (a) Draw the structures of major monohalo products in each of the following reactions : 1+1=2 OR (b) Give reasons for the following : 1+1=2 (i) Grignard reagent should be prepared under anhydrous conditions. (ii) Alkyl halides give alcohol with aqueous KOH whe…
    Board 20242 marksshort answer
12. The reaction of an alkyl halide with sodium alkoxide forming ether is known as : (A) Wurtz reaction (B) Reimer-Tiemann reaction (C) Williamson synthesis (D) Kolbe reaction
    Board 20241 markMCQ
13. {Z{_©V _w»` CËnmX {b{IE O~ : 3 1=3 (H$) NaI/EogrQ>moZ Ho$ gmW A{^{H«${`V {H$`m OmVm h¡ & (I) 2,4,6-Q´>mB H$m Ob-AnKQ>Z {H$`m OmVm h¡ & (J) n- ëH$mohm°br KOH Ho$ gmW A{^{H«${`V {H$`m OmVm h¡ &
    Board 20233 marksshort answer
14. SECTION – C 26. (a) (i) Write the mechanism of the following reaction : 2 + 1 2CH3CH2OH H+  413 K CH3 – CH2 – O – CH2 – CH3 + H2O (ii) Why ortho-nitrophenol is steam volatile while para-nitrophenol is not ? OR (b) What happens when (i) Anisole is treated …
    Board 20233 marksshort answer
15. CH3CONH2 on reaction with NaOH and Br2 in alcoholic medium gives : (a) CH3COONa (b) CH3NH2 (c) CH3CH2Br (d) CH3CH2NH2
    Board 20231 markMCQ
16. Two statements are given below - one labelled Assertion (A) and the other labelled Reason (R). Assertion (A): 2-Methoxy-2-methyl propane reacts with hydrogen iodide to form methyl alcohol and 2-Iodo-2-methylpropane. Reason (R): The reaction given in (A) follow…
    CBSE practice 2023-241 markAssertion-Reason
17. Given below are two statements labelled as Assertion (A) and Reason (R) Assertion (A): Phenol on treatment with Br2 in CS2 gives ortho and para bromophenol. Reason (R): Carbon disulphide is a solvent of low polarity, hence leads to monobromination of phenols S…
    CBSE practice 2023-241 markAssertion-Reason
18. Assertion (A): Miscibility of ethers with water resembles those of alcohols of the same molecular mass. Reason (R): The oxygen of ether can also form hydrogen bonds with water. Select the most appropriate answer from the options given below: A. Both A and R ar…
    Sample paper 2026-271 markAssertion-Reason
19. An organic compound ‘A’ is having a molecular formula C7H8O. On oxidation with acidified KMnO4 it forms compound ‘B’ .Compound ‘B’ can also be obtained from compound C, on its reaction with NaOH and then with CO2 followed by hydrolysis. Compound C can be easil…
    CBSE practice 2023-243 marksshort answer
20. The image below shows the boiling point of first seven straight chain primary alcohols and first seven straight chain primary alkanes. 5 The boiling point of both the series increase monotonically with increasing size of the molecules. However, the slope of in…
    CBSE practice 2022-235 markslong answer

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