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Aldehydes, Ketones and Carboxylic Acids

Short Answer Type

71. Write the structure of compounds A and B:

bold space bold space bold space bold left parenthesis bold italic C bold italic H subscript bold 3 bold right parenthesis subscript bold 2 bold C bold space bold equals bold space bold O bold space bold rightwards arrow with bold space bold space bold space bold H bold C bold N bold space bold space bold space bold space on top bold space bold A bold space bold space bold space bold rightwards arrow with bold space bold space bold space bold space bold H subscript bold 3 bold O to the power of bold plus bold space bold space bold space on top bold B

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72.

Give the product of the reaction of acetaldehyde with sodium hydrogen sulphite.

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73.

Complete the following:

$bold italic C bold italic H subscript bold italic 3 bold italic C bold italic H bold italic O bold italic space bold italic rightwards arrow with bold italic N bold italic H subscript bold italic 2 bold italic C bold italic O bold italic N bold italic H bold italic N bold italic H subscript bold italic 2 on top$

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74.

Complete the following:

$bold left parenthesis bold italic C bold italic H subscript bold 3 bold right parenthesis subscript bold 2 bold italic C bold italic O bold space bold rightwards arrow with bold N bold H subscript bold 2 bold N bold H subscript bold 2 on top$

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75. What happens when ethanal reacts with excess of methanol in the presence of trace amount of HCl?

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76.

Explain Clemmensen’s reduction.

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77. Convert propanone into propane.

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78.

Write the structures of A and B.

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79. Write one distinction test for acetal-dehyde and acetone.

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80. What happens when ethanol is treated with concentrated sulphuric acid
(a) above 0°C, (b) below 0°C?

(a)When ethanol is treated with concentrated sulphuric acid at above 0°C paraldehyde is obtained.

(b) When ethanol is treated with concentrated sulphuric acid at below 0°C meta-aldehyde is obtained.

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