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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 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':

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

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(C H_{3})_{2} = N N H C O N H_{2}

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(C H_{3})_{2} C = 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 B $C H_{3} C H_{2} C H = N N H C O N H_{2}$
(i) Aldehydes reduce ammoniacal $A g N O_{3}$ to silver mirror:
(ii) $1^{\circ} a l c o h o l [O] - \to a l d e h y d e$ .
(iii) Aldehydes give addition product with ammonia derivative
$∴ A (C_{3} H_{8} O)$ is $1^{\circ}$ alcohol, $B (C_{3} H_{6} O)$ is aldehyde.
$C H_{3} C H_{2} C H_{2} O H (A) p r o p a n o l K_{2} C r_{2} O_{7} - ---- \to H_{2} S_{4} C H_{3} C H_{2} C H O (B) p r o p a n a l H_{2} N C O N H N H_{2} - --------- \to C H_{3} C H_{2} C H = (C) N N H C O N H_{2}$

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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

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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 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

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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

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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}

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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

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