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41.

Amine that cannot be prepared by Gabriel phthalimide synthesis is

  • aniline

  • benzylamine

  • methylamine

  • iso-butylamine


A.

aniline

Only aliphatic primary amines can be prepared by Gabriel synthesis. Aniline cannot be prepared by this method because aryl halides (C6H5Cl or C6H5Br) do not undergo nucleophilic substitution with potassium phthalimide under ordinary conditions to give N-phenyl phthalimide (i.e., cleavage of C-X bond in haloarenes is quite difficult).

RX = aliphatic halide


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42.

Lactose is made of

  • α-D-glucose only

  • α-D-glucose and β-D-glucose

  • α-D-galactose and β-D-glucose

  • β-D-galactose and β-D-glucose


43.

Gabriel phthalimide reaction is used for the preparation of

  • primary aromatic amines

  • secondary amines

  • primary aliphatic amines

  • tertiary amines


44.

During, acetylation of amines, what is replaced by acetyl group ?

  • Hydrogen atom attached to nitrogen atom

  • One or more hydrogen atoms attached to carbon atom

  • One or more hydrogen atoms attached to nitrogen atom

  • Hydrogen atoms attached to either carbon atom or nitrogen atom


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45.

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

  • aniline

  • nitrosobenzene

  • N-phenylhydroxylamine

  • p-hydroxyaniline


46.

RCON3heatRNCOH2ORNH2This reaction is known as:

  • Schmidt reaction

  • Wurtz reaction

  • Curtius reaction

  • Gabriel phthalimide reaction


47.

Consider the following compounds:

Correct order of the basic nature of the above compounds:

 

  • I<II<III<IV

  • IV<II<III<I

  • I<III<IV<II

  • II<IV<III<I


48.

The correct order of basicity of:

  • A> B > C > D

  • D > C>A> B

  • B > D > C > A

  • D>A> B > C


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49.

Consider the following consersion,

The reagent 'X' will be:

  • H3PO2

  • Cu2Cl2

  • HgSO4/H2SO4

  • H+/H2O


50.

Aniline when diazotised in cold and then treated with dimethyl aniline gives a coloured product. The structure of coloured product would be:


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