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Explain : (a) An aq. Solution to tropl...

Explain :
(a) An aq. Solution to troplylium bormide `(C_7 H_7Br)` on treatment with `AgNO_3` gives a pale yellow precipitate.
(b) Cycloheptatrienyl cation has a low `pi` -electron energy than its open-chain counterparts.
(c) Cyclo-octatetraene reacts with 2 mol of potassium to yield a stable compound.

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`(a),(b)`, and `(c)` are all examples of aromatic compounds.

(b) It is aromatic compound that is why it has low energy.
(c) .
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A compound A (C_(8)H_(10)O) upon treatment with alkaline solution of iodine gives a yellow precipitate. The filtrate on acidification gives a white solid B (C_(7)H_(6)O_(2)) . Write the structures of A and B.

A compound D(C_(8)H_(10)O) upon treatement with alkaline solution of iodine gives a yellow precipitate. The fibtrate on acidification gives a white solid E(C_(7)H_(6)O_(2)) . Write the structures of D,E and explain the formation of E.

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ) . (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same coloure at that of (C). (v) A solution of (A) on treatment with a solution of barium chloride gave a white precipitate of compound (F) Which was insoluble in conc. HNO_(3) and conc. HCl. The oxidation state of central metal ions of (A), (B) and (C ) compounds are respectively :

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ). (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same colour at that of (C ) . (v) A solutionof ( A) on treatment with a solution of barium chloride gas a white precipitate of compound (F) which was insoluble in conc. HNO_(3) and conc. HCl. The oxidation state of central metal ions of (A) , (B) and (C) compounds are respectively.

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ) . (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same coloure at that of (C). (v) A solution of (A) on treatment with a solution of barium chloride gave a white precipitate of compound (F) Which was insoluble in conc. HNO_(3) and conc. HCl. Which of the following is true for compound (C ).

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ). (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same colour at that of (C ) . (v) A solutionof ( A) on treatment with a solution of barium chloride gas a white precipitate of compound (F) which was insoluble in conc. HNO_(3) and conc. HCl. Which of the following is true for compound (C ).

An optically active compound A (assume dextrorotatory) has the molecular formula C_(7)H_(11)Br . A reacts with hydrogen bromide, in the absence of peroxides to yield isomeric products, B and C, with the molecular formula C_(7)H_(12)Br_(2) . Compound B is optically active, C is not. Treating B with 1 mol of potassium butoxide yields (+)-A . Treating C with 1 mol of potassium tert-butoxide yields (+-)-A . Treating A with potassium tert-butoxide yields D(C_(7)H_(10)) . Subjecting 1 mol of D to ozonolysis followed by treatement with zinc and acetic acid yields 2 moles of formaldehyde and 1 mole of 1,3-cyclopentanedione. The compound 'B' is:

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