Organic Chemistry : Some Basic Principles & Techniques Test

Result

Organic Chemistry : Some Basic Principles & Techniques Test - 1

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Weekly Quiz Competition

Question 1
4 / -1

The presence of carbon in an organic compound can be shown by

A
Heating the compound with sodium

B
Heating the compound with cupric oxide

C
Heating the compound on bunsen flame

D
Heating the compound with magnesium.

Solution

Compound when heated with CuO reduces CuO to Cu and oxidises C to CO₂ which turns lime water milky.
Question 2
4 / -1

In Lassaigne'stest for N, S and halogens, the organic compound is

A
Fused with sodium

B
Dissolved with sodamide

C
Extracted with sodamide

D
Fused with calcium

Solution

In Lassaigne's test organic compound is fused with sodium.
Question 3
4 / -1

The blue compound formed in the positive test for nitrogen with Lassaigne solution of an organic compound is

A
Na₄[Fe(CN)₅(NOS)]

B
Na₃[Fe(CN)₆]

C
Fe(CN)₃

D
Fe₄[Fe(CN)₆]₃

Solution

Ferriferrocyanide is the blue complex formed by sodium ferrocyanide and NaCN.
Question 4
4 / -1

If on adding FeCl₃ solution to acidified Lassaigne solution, a blood red colouration is produced, it indicates the presence of

A
S

B
N

C
N and S

D
S and Cl

Solution
Question 5
4 / -1

During sodium extract preparation for Lassaigne's test both N and S present in organic compound change to

A
NaCN and Na₂S

B
NaNH₂ and Na₂SO₄

C
NaSCN

D
NaNO₃ and Na₂S

Solution

Na + C + N + S → NaSCN