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Chemistry Part-II

Haloalkanes and Haloarenes

The treatment of alkyl chlorides with aqueous KOH leads to the

Chemistry Part-II

Class 12

NCERT

Chapter 1: Haloalkanes and Haloarenes

33 questions

Give the IUPAC names of the following compounds:

C H_{3} C H (Cl) C H (B r) C H_{3}

The treatment of alkyl chlorides with aqueous

K O H

leads to the formation of alcohols but in the presence of alcoholic

K O H

, alkenes are major products. Explain.

Write the structures of the following organic halogen compounds.

(i) 2-Chloro-3-methylpentane    (ii) p-Bromochlorobenzene
(iii) 1-Chloro-4-ethylcyclohexane    (iv) 2r-(2-Chlorophenyl)-1-iodooctane
(v) 2-Bromobutane   (vi) 4-tert-Butyl-3-iodoheptane
(vii) 1-Bromo-4-sec-butyl-2-methylbenzene   (viii) 1,4-Dibromobut-2-ene

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Chapter 2: Alcohols, Phenols and Ethers

38 questions

Chapter 3: Aldehydes, Ketones and Carboxylic Acids

26 questions

Chapter 4: Amines

18 questions

Chapter 5: Biomolecules

25 questions

Chapter 6: Polymers

21 questions

Chapter 7: Chemistry in Everyday Life

27 questions

Question

Hard

Solving time: 4 mins

The treatment of alkyl chlorides with aqueous $K O H$ leads to the formation of alcohols but in the presence of alcoholic $K O H$ , alkenes are major products. Explain.

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Updated on: Dec 7, 2023

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Chemistry Part-II (NCERT)

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The treatment of alkyl chlorides with aqueous

K O H

leads to the formation of alcohols but in the presence of alcoholic

K O H

, alkenes are major products. Explain.

9 mins ago

Discuss this question LIVE

9 mins ago

Text solutionVerified

R - Cl + K O H (aq) \to R - O H + K Cl

The ionization of aqueous KOH produces hydroxide ions which are strong nucleophiles. Hence, alkyl chlorides undergo substitution to form alcohol.

R - C H_{2} - C H_{2} - Cl + K O H (alc) \to R - C H = C H_{2} + K Cl + H_{2} O

Alcoholic KOH solution gives alkoxide ion which is a strong base. It abstracts

β

hydrogen atom of alkyl chloride. A molecule of HCl is eliminated and an alkene is formed.

Note: The basicity of hydroxide ion is much lower than the basicity of alkoxide ion as hydroxide ion is significantly hydrated in aqueous solution.
Hence, hydroxide ion cannot abstract

β

hydrogen atom of alkyl chloride.

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Practice more questions from Chemistry Part-II (NCERT)

Give the IUPAC names of the following compounds:

C H_{3} C H (Cl) C H (B r) C H_{3}

The treatment of alkyl chlorides with aqueous

K O H

leads to the formation of alcohols but in the presence of alcoholic

K O H

, alkenes are major products. Explain.

Write the structures of the following organic halogen compounds.

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Question Text	The treatment of alkyl chlorides with aqueous $K O H$ leads to the formation of alcohols but in the presence of alcoholic $K O H$ , alkenes are major products. Explain.
Updated On	Dec 7, 2023
Topic	Haloalkanes and Haloarenes
Subject	Chemistry
Class	Class 12
Answer Type	Text solution:1 Video solution: 10
Upvotes	1066
Avg. Video Duration	5 min

The treatment of alkyl chlorides with aqueous $K O H$ leads to the formation of alcohols but in the presence of alcoholic $K O H$ , alkenes are major products. Explain.

Text solutionVerified

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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.

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The treatment of alkyl chlorides with aqueous $K O H$ leads to the formation of alcohols but in the presence of alcoholic $K O H$ , alkenes are major products. Explain.