15518
An ether is heated with phosphorous penta sulphide to give
1 Alkanthiol
2 Dialkyl sulphide
3 Hydrogen sulphide
4 Thioester
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15519
Phenol \(\mathop {\xrightarrow{{(i)\,NaOH}}}\limits_{(ii)\,C{O_2}/140\,^oC} A\xrightarrow{{{H^ + }/{H_2}O}} \) \(B\mathop {\xrightarrow{{A{l_2}{O_3}}}}\limits_{C{H_3}COOH,\,\Delta } C\)In this reaction, the end product \(C\) is :
1 salicylaldehyde
2 salicylic acid
3 phenyl acetate
4 aspirin
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15520
In the Liebermann’s nitroso reaction changes in the colour of phenol occurs as:
1 Brown or red-greenish red-deep blue
2 red-deep blue-green
3 red-green-white
4 white-red-green
Explanation:
In Liebermanns nitroso reaction, phenol is treated with sodium nitrite in presence of concentrated sulphuric acid and heated gently to obtain a blue colour. It is then diluted with water to obtain red solution. On basification, with dil. \(NaOH\) solution, it turns blue. Thus, the colour change is brown or red-greenish red-deep blue.
15518
An ether is heated with phosphorous penta sulphide to give
1 Alkanthiol
2 Dialkyl sulphide
3 Hydrogen sulphide
4 Thioester
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15519
Phenol \(\mathop {\xrightarrow{{(i)\,NaOH}}}\limits_{(ii)\,C{O_2}/140\,^oC} A\xrightarrow{{{H^ + }/{H_2}O}} \) \(B\mathop {\xrightarrow{{A{l_2}{O_3}}}}\limits_{C{H_3}COOH,\,\Delta } C\)In this reaction, the end product \(C\) is :
1 salicylaldehyde
2 salicylic acid
3 phenyl acetate
4 aspirin
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15520
In the Liebermann’s nitroso reaction changes in the colour of phenol occurs as:
1 Brown or red-greenish red-deep blue
2 red-deep blue-green
3 red-green-white
4 white-red-green
Explanation:
In Liebermanns nitroso reaction, phenol is treated with sodium nitrite in presence of concentrated sulphuric acid and heated gently to obtain a blue colour. It is then diluted with water to obtain red solution. On basification, with dil. \(NaOH\) solution, it turns blue. Thus, the colour change is brown or red-greenish red-deep blue.
15518
An ether is heated with phosphorous penta sulphide to give
1 Alkanthiol
2 Dialkyl sulphide
3 Hydrogen sulphide
4 Thioester
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15519
Phenol \(\mathop {\xrightarrow{{(i)\,NaOH}}}\limits_{(ii)\,C{O_2}/140\,^oC} A\xrightarrow{{{H^ + }/{H_2}O}} \) \(B\mathop {\xrightarrow{{A{l_2}{O_3}}}}\limits_{C{H_3}COOH,\,\Delta } C\)In this reaction, the end product \(C\) is :
1 salicylaldehyde
2 salicylic acid
3 phenyl acetate
4 aspirin
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15520
In the Liebermann’s nitroso reaction changes in the colour of phenol occurs as:
1 Brown or red-greenish red-deep blue
2 red-deep blue-green
3 red-green-white
4 white-red-green
Explanation:
In Liebermanns nitroso reaction, phenol is treated with sodium nitrite in presence of concentrated sulphuric acid and heated gently to obtain a blue colour. It is then diluted with water to obtain red solution. On basification, with dil. \(NaOH\) solution, it turns blue. Thus, the colour change is brown or red-greenish red-deep blue.
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ALCOHOLS, PHENOLS AND ETHER
15518
An ether is heated with phosphorous penta sulphide to give
1 Alkanthiol
2 Dialkyl sulphide
3 Hydrogen sulphide
4 Thioester
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15519
Phenol \(\mathop {\xrightarrow{{(i)\,NaOH}}}\limits_{(ii)\,C{O_2}/140\,^oC} A\xrightarrow{{{H^ + }/{H_2}O}} \) \(B\mathop {\xrightarrow{{A{l_2}{O_3}}}}\limits_{C{H_3}COOH,\,\Delta } C\)In this reaction, the end product \(C\) is :
1 salicylaldehyde
2 salicylic acid
3 phenyl acetate
4 aspirin
Explanation:
ALCOHOLS, PHENOLS AND ETHER
15520
In the Liebermann’s nitroso reaction changes in the colour of phenol occurs as:
1 Brown or red-greenish red-deep blue
2 red-deep blue-green
3 red-green-white
4 white-red-green
Explanation:
In Liebermanns nitroso reaction, phenol is treated with sodium nitrite in presence of concentrated sulphuric acid and heated gently to obtain a blue colour. It is then diluted with water to obtain red solution. On basification, with dil. \(NaOH\) solution, it turns blue. Thus, the colour change is brown or red-greenish red-deep blue.
