CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Acidity of Alcohols and Phenols

a An organic ...

Question

a) An organic compound (A) of molecular formula $C_{2} H_{6} O$ liberates hydrogen with metallic sodium. Compound (A) on heating with conc. $H_{2} S O_{4}$ at 440K gives an alkene (B). Compound (B) when oxidised by baeyer's reagent gives compound (C) of molecular formula $C_{2} H_{6} O_{2}$ . Identify A,B and C and explain the above reactions.
b) The metal (A) is extracted from its sulphide ore. On treatment with dilute nitric acid metal (A) gives a compound (B), which is also known as lunar caustic. (B) on heating at 723K gives (C) and $O_{2}$ . Identify A,B and C and explain the reactions.

Open in App

Solution

a)
$C_{2} H_{6} O N a \to$ liberates $H_{2}$ gas
(A) $440 K - ------ \to C o n c H_{2} S O_{4}$ $(B)$ $B a e y e r s - ---- \to R e a g e n t$ $(C)$
i) An organic compound (A) liberates $H_{2}$ gas with metallic $N a$ and so it must be a primary alcohol from the molecular formula (A) is identified as $C_{2} H_{5} O H$ ethanol $2 C_{2} H_{5} O H + 2 N a \to 2 C_{2} H_{5} O H + H_{2}$
ii) Ethanol on treatment with Conc. $H_{2} S O_{4}$ at 440K gives ethylene $C_{2} H_{4}$ as (B) $C_{2} H_{5} O H C o n c . - --- \to H_{2} S O_{4} C H_{2} = C H_{2} + H_{2} O$
iii) Ethylene on treatment with Baeyer's reagent ( Cold Dilute Alkaline $K M N O_{4}$ ) gives ethylene glycol as (C)
(b)
i) Metal (A) is silver. Silver is extracted from sulphide ore argentite $A g_{2} S$ .
ii) (A) Silver reacts with dilute nitric acid to give (B) silver nitrate which is called as lunar caustic.
$3 A g + 4 H N O_{3} \to 3 A g N O_{3} + N O + 2 H_{2} O$
iii) Lunar caustic on heating at 723K gives (C) silver nitrite $+ O_{2}$
$2 A g N O_{3} 723 K \to 2 A g N O_{2} + O_{2}$

A is Silver $A g$
B is Silver nitrate $A g N O_{3}$
C is Silver nitrite $A g N O_{2}$

Suggest Corrections

thumbs-up

0

Similar questions

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]

[B]

with acidified potassium dichromate also gives

[D]

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

[E]

Q. An organic compound (A) of molecular formula

C_{6} H_{6} O

gives violet colour with neutral ferric chloride. Compound (A) when heated with zinc dust gives a hydrocarbon (B). Also compound (A) reacts with phthalic anhydride and conc.

H_{2} S O_{4}

to give compound (C) of molecular formula

C_{20} H_{14} O_{4}

. Identify (A), (B) and (C). Explain the reactions.

Q. (a) Compound

(A)

with molecular formula

C_{6} H_{6} O

gives violet colour with neutral

F e {C l}_{3}

(A)

C H {C l}_{3}

N a O H

gives two isomers

(B)

(C)

with molecular formula

C_{7} H_{6} O_{2}

(A)

reacts with ammonia at

473 K

in the presence of

Z n {C l}_{2}

(D)

with molecular formula

C_{6} H_{7} N

(D)

undergoes carbylamine test. Identify

(A), (B), (C)

(D)

and explain the reactions.
(b)

(A)

is reddish brown metal. It belongs to group 11 and period 4 of the periodic table. When heated below

1370 K

(A)

given a black compound

(B)

1370 K

(A)

gives a red compound

(C)

. With concentrated nitric acid,

(A)

{N O}_{2}

gas and gives compound

(D)

(A), (B), (C)

(D)

. Explain the reactions.

Q. The organic compound A of molecular formula

C_{2} H_{6} O

liberates hydrogen gas with sodium metal. A gives B of formula

C_{4} H_{10} O

, when it reacts with concentrated

H_{2} S O_{4}

at 413K. At 443K with concentrated

H_{2} S O_{4}

A gives compound C of formula

C_{2} H_{4}

. This compound C decolourises bromine water. What are A, B, and C?

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

(B)

Z n - C u

couple to give back compound

(A)

(B)

on mild oxidation with

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

(C)

of molecular formula

C_{7} H_{6} O

(A), (B),

(C)

. Explain the reactions.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Chemical Properties of Alcohols 1

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Acidity of Alcohols and Phenols

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon