This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Preparation of Amines – 1”.
1. The amine formed from an amide by means of bromine and alkali has how many number of carbon atoms?
a) Same number of C atoms as that of amide
b) One less C atom than that of amide
c) One more C atom than that of amide
d) Two more C atoms than that of amide
Explanation: The amine formed from an amide by means of bromine and alkali has one less C atom than that of amide.
3. Ethylamine can be prepared by the action of bromine and caustic potash on which compound?
d) Methyl cyanide
Explanation: Ethylamine can be prepared by the action of bromine and caustic potash on propioamide.
CH3 – CH2 – CO – NH2 + Br2 + 4KOH → CH3CH2NH2 + K2CO3 + 2KBr + 2H2O
4. Reduction of nitroalkanes yields which compound?
d) Diazo compounds
5. What is the name of the reaction when acetamide changes into methylamine?
a) Hofmann bromamide reaction
b) Hofmann reaction
c) Friedel-Craft’s reaction
d) Hinsberg reaction
Explanation: When an amide is treated with bromine in an aqueous or ethanolic solution of sodium hydroxide, degradation of amide takes place leading to the formation of primary amine. This reaction involving degradation of amide and is popularly known as Hoffmann bromamide degradation reaction.
6. When methyl iodide is heated with ammonia, what is the product obtained?
d) A mixture of the above three amines
Explanation: When methyl iodide is heated with ammonia, the product obtained is mixture of methylamine, dimethylamine, trimethylamine.
7. The Hinsberg’s method is used for which of the following?
a) Preparation of primary amines
b) Preparation of secondary amines
c) Preparation of tertiary amines
d) Separation of amine mixtures
Explanation: The Hinsberg reaction is a test for the detection of primary, secondary and tertiary amines. In this test, the amine is shaken well with Hinsberg reagent in the presence of aqueous alkali (either KOH or NaOH). A reagent containing an aqueous sodium hydroxide solution and benzenesulfonyl chloride is added to a substrate.
8. Which one of the following compound gives a secondary amine on reduction?
c) Methyl isocyanide
d) Methyl cyanide
10. When ethanol is mixed with ammonia and passed over alumina the compound formed is which compound?
Explanation: When ethanol is mixed with ammonia and passed over alumina the compound formed is amine.
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