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Question 31 Mark
Cyclohexanamine Imageis more basic than benzenamine Imagewhy?
Answer
In cyclohexanamine, the lone electron pair of nitrogen is easily available because there is no resonance in it, whereas in benzenamine (aniline), the lone electrons pair of nitrogen is not easily available due to resonance, hence cyclohexanamine is more basic than aniline.
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Question 41 Mark
Ethanamine is completely soluble in water, whereas benzenamine (aniline) is almost insoluble in water, why?
Answer
Ethanamine easily forms inter molecular hydrogen bonds with water, hence it is completely soluble in water. Due to the large, size of the phenyl group in aniline, it is unable to form hydrogen bonds with water, hence it is almost insoluble in water.
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Question 71 Mark
How to differentiate between $2^{\circ}$ and $3^{\circ}$ amines using Hinsberg reagent?
Answer
$2^{\circ}$ amine reacts with Hinsberg reagent but $3^{\circ}$ amine does not react with Hinsberg reagent.
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Question 81 Mark
A primary amine $($molecular weight $31)$ reacts with carbon disulphide in the presence of $HgCl_2$ to form a compound which smells like mustard oil. Give the formula and chemical equation of primary amine.
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Question 131 Mark
Mention the use of Benadryl. Also tell the functional group present in it.
Answer
Benadryl is used as an antihistamine an tertiary amine group is present in it.
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Question 141 Mark
Name two bioactive amines which are used in increasing blood pressure.
Answer
Adrenaline and Ephedrine. These are secondary amines.
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Question 151 Mark
Mention the natural sources of amines.
Answer
In nature, amines are found in proteins, vitamins, alkaloids and hormones.
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Question 181 Mark
Write the order of boiling point of primary secondary and tertiary amines of equal molecular masses.
Answer
Primary amine $>$ Secondary amine $>$ Tertiary amine.
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Question 191 Mark
What will be the main product obtained when alkyl halide is treated with excesss ammonia?
Answer
Primary amine
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