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Byju's Answer

Standard XII

Chemistry

Functional Group

An organic co...

Question

An organic compound (A) with molecular formula $C_{7} H_{8} O$ dissolves in NaOH and gives characteristic colour with $F e C l_{3} .$ On treatment with $B r_{2},$ it gives a tribromo product $C_{7} H_{5} O B r_{3} .$ The compound is :

p-Hydroxybenzene

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2-Methoxy-2-phenyl propane

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m-Cresol

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p-Cresol

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Solution

The correct option is C m-Cresol

Reactivity of m-Cresol with NaOH and $F e C l_{3}$ suggests (A) to be a phenol.

The formation of a tribromo product suggests that 0- and p-positons are vacant.

So the methyl group should be present at m-position. Hence, (A) is m-cresol.

Hence the correct option is C.

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Similar questions

Q. An organic compound (A) of molecular formula

C_{7} H_{8} O

on treatment with lead nitrate gives a compound (B) of molecular formula

C_{7} H_{6} O

. (B) on chlorination in presence of

F e C l_{3}

form compound (C). Identify A, B and C, write the reactions.

Q. An organic compound

[A]

having molecular formula

C_{2} H_{7} N

on treatment with nitrous acid gives a compound

[B]

having molecular formula

C_{2} H_{6} O

[B]

on treatment with an organic compound

[C]

gives a carboxylic acid

[D]

and a sweet smelling compound

[E]

. Oxidation of

[B]

with acidified potassium dichromate also gives

[D]

Identify

[A], [B], [C], [D]

and

[E]

Q. An organic compound

[A]

having molecular formula

C_{2} H_{7} N

on treatment with nitrous acid gives a compound

[B]

having molecular formula

C_{2} H_{6} O

[B]

on treatment with an organic compound

[C]

gives a carboxylic acid

[D]

and a sweet smelling compound

[E]

. Oxidation of

[B]

with acidified potassium dichromate also gives

[D]

Write balanced chemical equation of

[D]

with chlorine in the presence of red phosphorus and name the reaction.

Q. An organic compound X with molecular formula

C_{5} H_{10} O

gives test with phenyl hydrazine but gives a negative response to iodoform test and Tollen’s test. It produces n-pentane on reduction. The compound could be

Q. An organic compound

(A)

of molecular formula

C_{7} H_{8}

on treatment with

C l_{2}

in the presence of sunlight gives compound

(B)

of molecular formula

C_{7} H_{7} C l

. Compound

(B)

reacts with

Z n - C u

couple to give back compound

(A)

. Compound

(B)

on mild oxidation with

C u (N O_{3})_{2}

gives

(C)

of molecular formula

C_{7} H_{6} O

. Identify

(A), (B),

and

(C)

. Explain the reactions.

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An organic compound (A) with molecular formula C7H8O dissolves in NaOH and gives characteristic colour with FeCl3. On treatment with Br2, it gives a tribromo product C7H5OBr3. The compound is :

The correct option is C m-CresolReactivity of m-Cresol with NaOH and FeCl3 suggests (A) to be a phenol. The formation of a tribromo product suggests that 0- and p-positons are vacant. So the methyl group should be present at m-position. Hence, (A) is m-cresol.Hence the correct option is C.

An organic compound (A) with molecular formula $C_{7} H_{8} O$ dissolves in NaOH and gives characteristic colour with $F e C l_{3} .$ On treatment with $B r_{2},$ it gives a tribromo product $C_{7} H_{5} O B r_{3} .$ The compound is :