Long Answer Questions in Organic Chemistry Class-10 Concise ICSE Selina Solutions Chapter-12 Miscellaneous Exercise. Solutions explain with reaction and structure to understand the topic in more effective way. The given Solutions is according to the Latest editions. Visit official Website CISCE for detail information about ICSE Board Class-10.

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

Long Answer Questions in Organic Chemistry with Solutions

Page-225

Que-1: A compound X when treated with an organic acid Y (having vinegar like smell) in the presence of the acid Z, forms a compound P which has fruity smell.

(a) Identify X, Y and Z
(b) Write structural formula of X and Y.
(c) What type of compound P is?
(d)Name the above reaction.
(e) If compound X and Y both have 2 carbon atoms. Write the reaction.

Ans:
(a) X = Ethanol, C₂H₅OH
Y = Acetic acid, CH₃COOH
Z = Conc. H₂SO₄
(b)

(c) Compound P is an ester named ethyl acetate.
(d) Esterification
(e)

Que-2: Compound A is bubbled through bromine dissolved in carbon tetrachloride and the product is CH₂Br – CH₂Br.

(a) Draw the structural formula of A.
(b) What type of reaction has A undergone?
(c) What is your observation?
(d) Name (not formula) the compound formed when steam reacts with A in the presence of phosphoric acid.
(e) What is the procedure for converting the product of (e) back to A?

Ans:
(a) H₂C = CH₂
(b) Addition reaction
(c) Bromine solution gets decolourised
(d) Ethanol
(e) By heating it (ethanol) with concentrated sulphuric acid at 170°C

Que-3: Draw the structural formula for each of the following-

(a) Ethanoic acid
(b) But-2-yne
(c) Methanoic acid
(d) Ethanal
(e) Ethyne
(f) Acetone
(g) 2-methyl propane
(h) An isomer of n-butane
(i) 2-propanol
(j) ethanol
(k) 1-propanal
(l) ethanoic acid
(m) 1,2, dichloroethane

Ans:
(a) Structural formula of Ethanoic acid is shown below:

(b) Structural formula of But-2-yne is shown below:

(c) Methanoic acid:

(d) Ethanal:

(e) Ethyne:
H-C≡C-H
(f) Acetone:

(g) 2-methyl propane:

(h) An isomer of n-butane:

(i) 2-propanol:

(j) ethanol:

(k) 1-propanal:

(l) ethanoic acid:

(m) 1,2, dichloroethane:

Que-4: Give balanced chemical equations for the following conversions:

(a) Ethanoic acid to ethyl ethanoate
(b) Calcium carbide to ethylene
(c) Sodium ethanoate to methane
(d) Ethyl chloride to ethyl alcohol
(e) Ethyl chloride to ethene
(f) Ethene to ethyl alcohol
(g) Ethyl alcohol to ethene

Ans:
(a) Ethanoic acid to ethyl ethanoate
CH₃COOH + C₂H₅OH   →  (Conc. H₂SO₄)   CH₃COOC₂H₅ + H₂O
(b) Calcium carbide to ethylene
CaC₂ + 2 H₂O → Ca(OH)₂ + CH º CH
(c) Sodium ethanoate to methane
CH₃COONa + NaOH    → (CaO  300ºC) Na₂CO₃ + CH₄
(d) By boiling ethyl chloride with aqueous NaOH.
C₂H₅-Cl + NaOH [aq.]   → boil   C₂H₅OH  + NaCl
(e) By boiling ethyl chloride with alcoholic KOH.
C₂H₅-Cl  +   KOH [aq.]  →boil    C₂H₄   +KCl  +  H2O
(f) Ethene is absorbed in conc. sulphuric acid at 80 °C under 30 atmos. to give ethyl hydrogen sulphate, which on hydrolysis with steam gives ethanol.
C₂H₄  +H₂SO₄ conc.    →   (80°C/30 atmos.)  C₂H₅-HSO₄ (Ethyl hydrogen sulphate )
C₂H₅-HSO₄  +   H₂O   steam    ⟶    C₂H₅-OH  + H₂SO₄
(g) By heating ethyl alcohol with concentrated H₂SO₄ at 170°C.
C₂H₅OH   →  (170°C/Conc. H₂SO₄ )    C₂H₄   +H₂O

—:  End of Long Answer Questions in Organic Chemistry Class-10 Concise ICSE Selina Solution : –

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