Menthanoic acid, the first member of carboxylic acid series, when warmed with concentrated sulphuric acid decompose in the following way and evolve carbon monoxide.

The driving force for this reaction lies in the fact that the $H C \equiv O^{+}$ ion is very unstable acid and thus easily loses H”.

Treatment of triphenylacetic acid with conc. $H_{2} S O_{4}$ gives:

(C_{6} H_{5})_{3} C H + C O

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(C_{6} H_{5})_{3} C H + C O_{2}

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(C_{6} H_{5})_{3} C O H + C O

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Solution

The correct option is C $(C_{6} H_{5})_{3} C O H + C O$

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Q. Benzoic acid on treatment with hydrazoic acid

(N_{3} H)

in the presence of concentrated sulphuric acid gives :

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Q. Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives?

What happens when (Give equations of the chemical reaction)
(i) Sodium ethanoate is heated with soda lime.
(ii) Ethanoic acid is warmed with methanol in presence of concentrated sulphuric acid.

Give reasons for the following:
(i) In the contact process, sulphur trioxide formed is dissolved in 98% sulphuric acid and not in water.
(ii) When solution of sulphur dioxide is exposed to air, it gets converted to sulphuric acid.
(iii) When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.
(iv) When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute.
(v) Sulphuric acid can form two kinds of salts with sodium chloride.
(vi) When barium chloride is added to dilute sulphuric acid, a white precipitate is formed.
(vii) When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed.
(viii) Ammonia gas cannot be dried by passing through concentrated sulphuric acid.
(ix) When concentrated sulphuric acid is added to sugar/glucose, a black mass is left behind.
(x) Concentrated sulphuric acid should not be added to oxalic acid or formic acid in the open laboratory.
(xi) When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white.
(xii) Concentrated sulphuric acid must be stored in airtight bottles.
(xiii) Cotton clothes get burnt with concentrated sulphuric acid.
(xiv) H₂SO₄ cannot be prepared by heating sodium sulphate with conc. HCl or HNO₃.

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The correct option is C (C6H5)3COH+CO

The correct option is C $(C_{6} H_{5})_{3} C O H + C O$