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Standard XII

Chemistry

Formation of Diazonium Salts

C 13 H 10 O C...

Question

$C_{13} H_{10} O C F_{3} C O_{3} H - ----- \to (A) H_{3} O^{+} - -- \to B + C$

With neutral $F e C l_{3}, C$ gives violet colour. B on decarboxylation and C on reduction with zinc dust, gives same compound. The correct statement is:

C gives dye test positive in weakly alkaline medium

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C gives dye test positive in weakly acidic medium

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C gives dye test positive in strongly alkaline medium

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B can be formed by oxidation of toluene with chromyl chloride

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Solution

The correct option is A C gives dye test positive in weakly alkaline medium
Starting compound is benzophenone.
B is benzoic acid and C is phenol.

Phenol gives azo dye test at a pH around 9-10.

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Similar questions

C_{13} H_{10} O C F_{3} C O_{3} H - ----- \to (A) H_{3} O^{+} - -- \to B + C

With neutral

F e C l_{3}, C

gives violet colour. B on decarboxylation and C on reduction with zinc dust, gives same compound. The correct statement is:

Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is

(a) neutral?

(b) strongly alkaline?

(d) weakly acidic?

(e) weakly alkaline?

Arrange the pH in increasing order of hydrogen-ion concentration.

(A), (B)

and

(C)

are three non-cyclic functional isomers of a carbonyl compound with molecular formula

C_{4} H_{8} O

. Isomers

(A)

and

(C)

give positive Tollen's test whereas isomer

(B)

does not give Tollen's test but gives positive Iodoform test. Isomers

(A)

and

(B)

on reduction with

Z n (H g) / c o n c

H C l

give the same product

(D)

Write the structures of

(A), (B), (C)

and

(D)

An organic compound ′A′(C3H4) on hydration in presence of H2SO4/HgSO4 gives white crystalline product (D) with sodium hydrogensulphite. It gives negative Tollen's test and positive iodoforn's test. On drastic oxidation ′B′ gives compound ′C′(C2H4O2) along with formic acid. Identify compounds ′A′,′B′ and ′C′ and explain all the reactions.

Q. (A),(B) and (C) are three non-cyclic functional isomers of a carbonyl compound with molecular formula

C_{4} H_{8} O .

Isomers (A) and (C) give positive Tollens' test whereas isomer (B) does not give Tollens' test but gives positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc. HCI give the same product (D).

(a) Write the structures of (A),(B),(C) and (B).

(b) Out of (A), (B) and (C) isomers, which one is least reactive towards addition of HCN?

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C13H10OCF3CO3H−−−−−−→(A)H3O+−−−→B+C With neutral FeCl3, C gives violet colour. B on decarboxylation and C on reduction with zinc dust, gives same compound. The correct statement is:

The correct option is A C gives dye test positive in weakly alkaline mediumStarting compound is benzophenone. B is benzoic acid and C is phenol. Phenol gives azo dye test at a pH around 9-10.

$C_{13} H_{10} O C F_{3} C O_{3} H - ----- \to (A) H_{3} O^{+} - -- \to B + C$

With neutral $F e C l_{3}, C$ gives violet colour. B on decarboxylation and C on reduction with zinc dust, gives same compound. The correct statement is:

The correct option is A C gives dye test positive in weakly alkaline medium
Starting compound is benzophenone.
B is benzoic acid and C is phenol.

Phenol gives azo dye test at a pH around 9-10.