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Standard IX

Chemistry

Molecular Formula

Compound 'A...

Question

Compound $^{'} A^{'}$ (molecular formula $C_{3} H_{8} O$ ) is treated with acidified potassium dichromate to form a product $^{'} B^{'}$ (molecular formula $C_{3} H_{6} O$ ). $^{'} B^{'}$ forms a shining silver mirror on warming with ammoniacal silver nitrate. $^{'} B^{'}$ when treated with an aqueous solution of $N H_{2} C O N H N H_{2}, H C l$ and sodium acetate gives a product $^{'} C^{'}$ . Identify the structure of $^{'} C^{'}$ .

C H_{3} C H_{2} C H = N N H C O N H_{2}

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C H_{3} - C | C H_{3} = N N H C O N H_{2}

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C H_{3} - C | C H_{3} = N C O N H N H_{2}

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C H_{3} C H_{2} C H = N C O N H N H_{2}

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Solution

The correct option is A $C H_{3} C H_{2} C H = N N H C O N H_{2}$
It is clear that $A$ is alcohol. On treating with acidified potassium dichromate, it forms an aldehyde or a ketone. Now, $B$ is an aldehyde as it gives silver mirror test. Hence $B$ is propanaldehyde $(C H_{3} C H_{2} C H O)$ .

$C H_{3} C H_{2} C H O + N H_{2} C O N H N H_{2} + H C l + C H_{3} C O O N a ⟶ C H_{3} C H_{2} C H = N N H C O N H_{2} (C)$
Hence, $C$ is $C H_{3} C H_{2} C H = N N H C O N H_{2}$

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Similar questions

Q. Compound '

A

' (molecular formula

C_{3} H_{8} O

is treated with acidified potassium dichromate to form a product '

B

' (molecular formula

C_{3} H_{6} O

). '

B

' forms a shining silver mirror on warming with ammoniacal silver nitrate. '

B

' when treated with an aqueous solution of

H_{2} N C O N H N H_{2}

and sodium acetate gives a product '

C

'. Identify the structure of '

C

Q. An excess of compound 'A' (molecular formula C₃H₈O) is treated with acidified potassium dichromate to form a product 'B' (molecular formula C₃H₆O). 'B' forms a shining silver mirror on warming with ammoniacal silver nitrate. 'B' when treated with an aqueous solution of H₂NCONHNH_2,HCl and sodium acetate, it gives a product 'C'. Identify the structure of 'C'

Q. Compound

(A)

(molecular formula

C_{3} H_{8} O

) is treated with acidified potassium dichromate to form a product B (molecular formula

C_{3} H_{6} O

). 'B' forms a shining silver mirror on warming with ammoniacal silver nirate. 'B' when treated with an aqueous solution of

H_{2} N C O N H N H_{2} \cdot H C l

and sodium acetate gives a product 'C'. Identify the structure of 'C':

Q. Compound

A

(molecular formula

C_{3} H_{8} O

) is treated with acidified potassium dichromate to form a product

B

(molecular formula

C_{3} H_{6} O

B

forms a shining silver mirror on warming with ammoniacal silver nitrate.

B

when treated with an aqueous solution of

H_{2} N C O N H {N H}_{2} . H C l

and sodium acetate gives a product

C

Identify the structure of

C

Q. Compound

(X)

with molecular formula

C_{3} H_{8} O

is treated with acidified potassium dichromate to form a product

(Y)

with molecular formula

C_{3} H_{6} O

(Y)

does not form a shining silver mirror on warming with ammoniacal

A g N O_{3}

(Y)

when treated with an aqueous solution of

N H_{2} C O N H N H_{2}

H C l

and sodium acetate, gives a product

(Z)

. The structure of

(Z)

is:

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