Which of the following statement(s) is/are incorrect in case of H

Subject

Chemistry

Class

JEE Class 12

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41.

Which of the following statement(s) is/are incorrect in case of Hofmann bromamide degradation?

  • Reaction is useful for decreasing length of carbon chain by one carbon atom

  • It gives tertiary amine

  • It gives primary amine

  • Aqueous or alco. KOH is used with bromine


B.

It gives tertiary amine

Among all the given statements, statement b is incorrect. The given statement is used to synthesise primary amine.

In this reaction, amide on reaction with Br2 in an aqueous or ethanolic solution of NaOH give 1° amine with one C atom less than that present in the amide.

RCONH2 + Br2 + 4KOH  RNH2 + 2KBr + K2CO3 + 2H2O


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42.

Aldehyde or ketones when treated with C6H- NH - NH2, the product formed is

  • semicarbazone

  • phenlhydrazone

  • hydrazone

  • oxime


43.

Which of the following is used as antiseptic?

  • Chloramphenicol

  • Bithional

  • Cimetidine

  • Chlordiazepoxide


44.

The amine, which reacts with p-toluenesulphonyl chloride to give a clear solution, which on acidification gives insoluble compound is

  • C2H5NH2

  • (C2H5)2NH

  • (C2H5)3N

  • CH3NHC2H5


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45.

Which of the following compound will give positive iodoform test?

  • Isopropyl alcohol

  • Propionaldehyde

  • Ethylphenyl ketone

  • Benzyl alcohol


46.

The conversion of ethyl bromide using sodium iodide and dry acetone, this reaction is known as

  • Swarts reaction

  • Finkelstein reaction

  • Sandmeyer reaction

  • Stephen reaction


47.

Which of the following in Baeyer's reagent?

  • Alkaline KMnO4

  • Acidic K2Cr2O7

  • Alkaline Na2Cr2O7

  • MnO2


48.

The polymer used in making handles of cookers and frying pans is

  • bakelite

  • nylon-2-nylon-6

  • orion

  • polyvinyl chloride


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49.

The amino acid, which is basic in nature is

  • histidine

  • tyrosine

  • proline

  • valine


50.

A molecule of stachyose contains how many carbon atoms?

  • 6

  • 12

  • 18

  • 24


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