Chemistry

An organic compound with the molecular formula C₉H₁₀O forms 2,4-DNP derivative, reduces Tollens' reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1,2-benzenedicarboxylic acid. Identify the compound.

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Nine

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Since the given compound with molecular formula C₉H₁₀O form a 2,4-DNP derivative and reduce Tollen's reagent, it must be an aldehyde. Since it undergoes cannizzaro reaction, therefore CHO group is directly attached to the benzene ring.

Since on vigorous oxidation, it gives 1,2-benzene dicarboxylic acid, therefore it must be ortho-substituted benzaldehyde. The only o-substituted aromatic aldehyde having molecular formula C₉H₁₀O is o—ethyl benzyldehyde all the reaction can show now be explained on the basis of this structure-

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9 months ago

Which of the following compounds is used for water softening?

(i) Ca₃(PO₄)₂

(ii) Na₃PO₄

(iii) Na₆P₆O₁₈

(iv) Na₂HPO₄

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Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

Option (iii)

Na₆P₆O₁₈

Sodium hexametaphosphate (Na₆P₆O₁₈), commercially called 'calgon', is used to remove hardness from water.

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9 months ago

Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile.

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Nine

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i) Taking two molecules of propanal, one which acts as a nucleophile and the other as an electrophile.

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9 months ago

Which of the following ions will cause hardness in the water sample?

(i) Ca²⁺

(ii) Na⁺

(iii) Cl^-

(iv) K⁺

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Nine

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This is a multiple choice answer as classified in NCERT Exemplar

Option (i)

Ca²⁺

Water becomes 'hard' when it contains calcium and magnesium salts in the form of hydrogen carbonate, chloride, and sulphate.

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9 months ago

Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

(i) CH₄(g) + H₂O(g) → CO(g) + H₂(g)

(ii) CO(g) + H₂O(g) → CO₂(g) + H₂(g)

(iii) C_nH_2n+2+ nH₂O(g) → nCO + (2n+1)H₂

(iv) CO(g)+2H₂(g) → CH₃OH(l)

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This is a multiple choice answer as classified in NCERT Exemplar

Option (iv)

CO (g)+2H₂ (g) → CH₃OH (l)

The reaction shown in equation (iv) shows the synthesis of methanol from water gas.

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9 months ago

How will you convert ethanal into the following compounds?

(i) Butane-1,3-diol

(ii) But-2-enal

(iii) But-2-enoic acid

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Nine

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1. Butane-1,3-diol -

Ethanol react dilute alkali produces 3-hydroxybutanal which on Reduction gives butane-1, 3-diol on reduction.

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9 months ago

Hydrogen peroxide is obtained by the electrolysis of _______.

(i) Water

(ii) Sulphuric acid

(iii) Hydrochloric acid

(iv) Fused sodium peroxide

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Nine

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This is a multiple choice answer as classified in NCERT Exemplar

Option (ii)

Sulphuric acid

2HSO₄^- (aq) → HO₃SOOSO₃H (aq) → 2HSO₄^- (aq)+2H⁺ (aq) + H₂O₂ (aq)

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9 months ago

When sodium peroxide is treated with dilute sulphuric acid, we get

(i) Sodium sulphate and water

(ii) Sodium sulphate and oxygen

(iii) Sodium sulphate, hydrogen and oxygen

(iv) Sodium sulphate and hydrogen peroxide

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Nine

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This is a multiple choice answer as classified in NCERT Exemplar

Option (iv)

Sodium sulphate and hydrogen peroxide.

Na₂O₂+dil H₂SO₄→ Na₂SO₄→ Na₂SO₄+H₂O₂

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9 months ago

Which of the following reactions increases production of Dihydrogen from synthesis gas?

(i) CH₄(g)+H₂O(g) → CO(g)+3H₂(g)

(ii) C(g)+H₂O(g) → CO(g)+H₂(g)

(iii) CO(g)+H₂O(g) → CO₂(g)+H₂(g)

(iv) C₂H₆+2H₂O → 2CO+5H₂O

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This is a multiple choice answer as classified in NCERT Exemplar

Option (iii)

CO (g)+H₂O (g) → CO₂ (g)+H₂ (g)

The production of dihydrogen can be increased by reacting carbon monoxide of syngas mixtures with steam in the presence of iron chromate as catalyst.

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9 months ago

Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation and Cannizzaro reaction.

(i) Methanal

(ii) 2-Methylpentanal

(iii) Benzaldehyde

(iv) Benzophenone

(v) Cyclohexanone

(vi) 1-Phenylpropanone

(vii) Phenylacetaldehyde

(viii) Butan-1-ol

(ix) 2,2-Dimethylbutanal

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