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 Multiple Choice QuestionsMultiple Choice Questions

501.

The correct IUPAC name of [Co(NH3)3(NO2)3] is

  • Triammine trinitro-N cobalt (III)

  • Triammine trinitro-N cobalt (II)

  • Triammine cobalt (III) nitrite

  • Triammine trinitro-N cobaltate (III)


502.

The replacement of diazonium group by fluorine is known as

  • Gattermann reaction

  • Sandmeyer reaction

  • Balz-Schiemann reaction

  • Etard reaction


503.

Identify the alkene that is produced in the following series of reactions

  


504.

An organic compound X having molecular formula C3H11N reacts with p-toluene sulphonyl chloride to form a compound Y that is soluble in aqueous KOH. Compound X is optically active and reacts with acety lchloride to form compound Z. Identify the compound Z

  • CH3CH2CH2CH2NHCOCH3

  • CH3CH2CH(CH3)NHCOCH3

  • CH3(CH3)CHCH2NHCOCH3


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505.

Diethyl amine when treated with nitrous acid yields

  • diethyl ammonium nitrite

  • ethyl alcohol

  • N-nitroso diethyl amine

  • triethyl ammonium nitrite


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506.

The amine 'A' when treated with nitrous acid gives yellow oily substance. The amine A is

  • triethylamine

  • trimethylamine

  • aniline

  • methylphenylamine


D.

methylphenylamine

Secondary amines when treated with nitrous acid give yellow oily substance. So, amine 'A' is methylphenyl amine. Reaction of nitrous acid with aliphatic amines,

Liberation of N2 gas + alcohol formation

R-NH2 + HNO2 → R-N+≡NCl- H2O ROH + N2 + HCl

Reaction of nitrous acid with aromatic amines

Liberation of N2 gas + Phenol formation

PhNH2 + HNO2 + HCl 273 -278 K Ph-N≡NCl- → PhOH + HCl + N2

Reaction of nitrous acid with 2° amines: With HNO2, they give nitroso amines, which being insoluble in dilute acids separate as yellow oily compound.

R2NH + HONO → R2-N-N=O

N-nitroso dialkyl amine (yellow oil)

Reaction of nitrous acid with 3° amines : Aliphatic 3° amines on reaction with HONO formsoluble nitrite salts, while aromatic 3° amines form green coloured p -nitroso amines.

             

 


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507.

In case of substituted aniline the group which decreases the basic strength is

  • -OCH3

  • -CH3

  • -NH2

  • -C6H5


508.

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


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509.

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


510.

Which one of the following can be prepared by Gabriel phthalimide synthesis?

  • Aniline

  • o- toluidine

  • Benzylamine

  • N-methylethanamine


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