Organic Chemistry Short Answer Questions Class-10 Concise ICSE Selina Solutions Chapter-12. We Provide Answer of Short Answer Questions of Miscellaneous Exercise-12 for ICSE Class-10 Chemistry. The given Solutions is according to the Latest editions. Visit official Website CISCE for detail information about ICSE Board Class-10.

Organic Chemistry Short Answer Questions Class-10 Concise ICSE Selina Solutions Chapter-12

Board	ICSE
Book / Publication	Concise / Selina
Subject	Chemistry
Class	10th
Writer	Dr SP Singh
Chapter-12	Organic Chemistry
Topics	Short Answer Questions
Edition	2025-2026

Short Answer Questions on Organic Chemistry

Page-225

Que-1:

(a) Why is pure acetic acid known as glacial acetic acid?
(b) Give a chemical equation for the reaction between ethyl alcohol and acetic acid.

Ans:
(a). Pure acetic acid is called glacial acid because it forms an ice-like solid when cooled.
(b)

Que-2: Find the odd one out and explain :

(i) C₃H₈
(ii) C₅H₁₀
(iii) C₂H₆
(iv)  CH₄

Ans: option (ii) C₅H₁₀ is an alkene, while the rest are alkanes.

Que-3:

(a) Define isomerism.
(b) Give the IUPAC name of the isomer C₄H₁₀ which has a branched-chain.

Ans:
(a) Isomerism: Compounds having the same molecular formula but different structural formulae are known as isomers, and the phenomenon is known as isomerism.
(b) The IUPAC name of the branched isomer of butane is 2-methyl propane

Que-4: Write equation of ethyl bromide with :

(a) aqueous NaOH
(b) alcoholic NaOH

Ans:

Que-5: Write balanced chemical equations for the following:

(a) Monochloroethane is hydrolysed with aqueous KOH.
(b) A mixture of sodalime and sodium acetate is heated.
(c) Ethanol under high pressure and low temperature is treated with acidified potassium dichromate.
(d) Water is added to calcium carbide.
(e) Ethanol reacts with sodium at room temperature.

Ans: 

(d) CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂ 
(e) 2C₂H₅OH+ 2Na → 2C₂H₅ONa + H₂ 

Que-6: Give the chemical equation for :

(a) The laboratory preparation of methane from sodium acetate.
(b) The reaction of one mole of ethene with one mole of chlorine gas.
(c) The preparation of ethyne from 1, 2-dibromoethane.
(d) Preparation of ethane from sodium propionate.
(e) preparation of ethanol from monochloroethane and aq. sodium hydroxide.

Ans:
(a) The laboratory preparation of methane from sodium acetate.

(b) The reaction of one mole of ethene with one mole of chlorine gas.

(c) The preparation of ethyne from 1, 2-dibromoethane.

(d) Preparation of ethane from sodium propionate.

(e) Preparation of ethanol from monochloroethane and aq. sodium hydroxide.

Que-7: Distinguish ethane and ethene (using alkaline potassium permanganate solution).

Ans: Ethenegas decolourises the purple colour of KMnO₄, whereas ethane does not decolourise KMnO₄ solution.

Que-8: The structures of six organic compounds are shown:

(a) Identify two of the compounds that are members of the same homologous series but are not isomers.
(b) Which two compounds are isomers of each other?
(c) F can be prepared from D. Give a chemical equation for the reaction.

Ans: 
(a) A and F
(b) C and E
(c) C₂H₅OH  → (Conc. H₂SO₄)(170ºC)     C₂H₄ ↑ + H₂O

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