Q55.Which of the following on heating with aqueous KOH , produces acetaldehyde ? (1) CH3COCl (2) CH3CH2Cl (3) CH2ClCH2Cl (4) CH3CHCl2
What This Question Tests
This question requires knowledge of reactions of halogenated compounds with aqueous KOH, specifically recognizing that gem-dihalides form unstable gem-diols which then yield aldehydes upon dehydration.
Concepts Tested
📚 NCERT Sections This Tests
6.20 — The Treatment Of Alkyl Chlorides With Aqueous Koh Leads To The Formation Of
Chemistry Class 12 · Chapter 6
6.20 The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH, alkenes are major products. Explain.
7.13 — Show How Will You Synthesise:
Chemistry Class 12 · Chapter 7
7.13 Show how will you synthesise: (i) 1-phenylethanol from a suitable alkene. (ii) cyclohexylmethanol using an alkyl halide by an SN2 reaction. (iii) pentan-1-ol using a suitable alkyl halide?
6.22 — What Happens When
Chemistry Class 12 · Chapter 6
6.22 What happens when (i) n-butyl chloride is treated with alcoholic KOH, (ii) bromobenzene is treated with Mg in the presence of dry ether, (iii) chlorobenzene is subjected to hydrolysis, (iv) ethyl chloride is treated with aqueous KOH, (v) methyl bromide is treated with sodium in the presence of dry ether, (vi) methyl chloride is treated with KCN? Answers to Some Intext Questions 6.1 6.2 (i) H2SO4 cannot be used along with KI in the conversion of an alcohol to an alkyl iodide as it converts KI to corresponding acid, HI which is then oxidised by it to I2. 6.3 (i) ClCH2CH2CH2Cl (ii) ClCH2CHClCH3 (iii) Cl2CHCH2CH3 (iv) CH3CCl2CH3 191 Haloalkanes and Haloarenes Reprint 2025-26
📋 Question Details
- Chapter
- Haloalkanes & Haloarenes
- Topic
- Hydrolysis of haloalkanes
- Year
- 2009
- Shift
- Unknown
- Q Number
- Q55
- Type
- MCQ
- NCERT Ref
- Class 12 Chemistry Ch 10: Haloalkanes and Haloarenes
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