Ncert Solutions Chemistry Class 12th

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Vishal Baghel

Contributor-Level 10

(a) List-I List-II
CO, HCl Anhydrous AlCl? /CuCl → (ii) Gattermann-Koch reaction
(b) R – C=O .
(c) R – CH? OH + R'COOH - (conc. H? SO? )-> (iv) Esterification
(d) R – CH? COOH - ( (i) X? /RedP (ii) H? O )-> (i) Hell-Volhard Zelinsky reaction

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Vishal Baghel

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CH? – CH? – COO? Na? - (NaOH, CaO, Heat)-> CH? – CH? + Na? CO?
Decarboxylation takes place by soda-lime (NaOH + CaO)

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Vishal Baghel

Contributor-Level 10

Most of the trivalent lanthanoid ions are coloured in the solid state.

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Vishal Baghel

Contributor-Level 10

Teflon are prepared by addition polymerization from tetrafluroethene.
CF? = CF? - (catalyst, High pressure)-> [–CF? – CF? –]? Teflon
Nylon-66, Novolac, Dacron are prepared by condensation polymerisation.

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Vishal Baghel

Contributor-Level 10

Dimethylammonium acetate is a weak acid & weak base type of salt.
pH = 7 + ½ pK? – ½ pK?
= 7 + ½ * 4.77 – ½ * 3.27
= 7.75

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Vishal Baghel

Contributor-Level 10

Element % At. Weight (% / At.weight) the simplest ratio
C 78 12 6.5 1
H 22 1 22 ≈ 3

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Vishal Baghel

Contributor-Level 10

Aspirin and paracetamol belongs to the class of non-narcotic analgesic.
Morphine and heroin are narcotic analgesics.

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Vishal Baghel

Contributor-Level 10

In the presence of peroxide, addition of HBr to unsymmetrical alkenes take place by anti-Markovnikov's rule/Peroxide effect/Kharash effect.

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Vishal Baghel

Contributor-Level 10

π = iCRT
P? = 1 * (10/180) * R * T (For Glucose)
P? = 1 * (10/60) * R * T (For Urea)
P? = 1 * (10/342) * R * T (For Sucrose)

∴ P? > P? > P?

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Vishal Baghel

Contributor-Level 10

10amines react with Hingsberg's reagent to give a solid, which dissolve in alkali.

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