Name of method use to separate primary, secondary and tertiary am

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 Multiple Choice QuestionsMultiple Choice Questions

591.

Chlorobenzene gives aniline with

  • NH3/ Cu2O

  • NH3/ H2SO4

  • NaNH2

  • None of these


592.

In the reaction RH2 HNO2 A + B + C↑ is:

  • NH3

  • N2

  • O2

  • CO2


593.

Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound of water during the reaction is continuously removed. The compound formed is generally known as

  • an amine

  • an imine

  • an enamine

  • a Schiff's base


594.

In the following sequence of reactions

C2H5Br AgCN X Reduction  Y; Y is

  • n-propyl amine

  • isopropylamine

  • ethylamine

  • ethylmethyl amine


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595.

The number of σ and π bonds in a molecule of acetonitrile are respectively :

  • 2,5

  • 3,4

  • 4,3

  • 5,2


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596.

Name of method use to separate primary, secondary and tertiary amines is

  • Hofmann method

  • Lucas method

  • Victor Meyer method

  • Kolbe method


A.

Hofmann method

(a) In Hofmann method,a mixture of primary, secondary and tertiary amines is treated with diethyloxalate, when primary amines forms solid oxamide, secondary amines forms a liquid oxamic ester whereas tertiary amines remains unaffected.

(b) With Lucas reagent, 3° alcohols immediately produce turbidity, 2° alcohols give turbidity within 5 minutes while 1° alcohols give no turbidity at room temperature.

(c) In Victor Meyer test, 1° alcohols give blood red colour, 2° alcohols give blue colour while 3° alcohols give no colour.

(d) Kolbe method is used to introduce a -COOH group in phenol.


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597.

An organic amino compound reacts with aqueous nitrous acid at low temperature to produce an oily nitroso amine. The compound is

  • CH3NH2

  • CH3CH2NH2

  • CH3CH2NHCH2CH3

  • (CH3CH2)3N


598.

Which of the following will have larger dipole moment?


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599.

Which of the following is not a usual method for the preparation of primary amines ?

  • Hofmann's method

  • Gabriel phthalimide reaction

  • Curtius method

  • Reductive amination of >C=O


600.

What is the product when nitrobenzene is treated sequentially with (i) NH4Cl/Zn dust and (ii) H2SO4/ Na2Cr2O7 ?

  • m-chloronitrobenzene

  • p-chloronitrobenzene

  • nitrosobenzene

  • benzene


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