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421. Sodium Bisulphite is used for the purification of aldehydes and Ketones. Explain ?

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422. Explain with suitable example:
(i) Clemenson reduction, (ii) Wolff-Kishner reduction.

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423. How would you distinguish between pentanal and diethyl ketone?

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424.

what happens when (CH₃)₃CCOOH reacts with bromine in the presence of red Phosphorous ?

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Acetophenone on reaction with sodium hypoidite give iodoform (yellow ppt). Benzophenone does not give this test.

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426.

Give one use of benzene-1,4 dicarboxylic acid.

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427. What happens when formaldehyde is treated with ammonia?

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428. What happens when acetaldehyde is react with benzaldehyde with strong aqueous alkali solution ?

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429. What happens when formaldehyde is treated with conc.NaOH solution?

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430.

discuss hell -vollhard -zelinsky reaction (HVZ) ?

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