Q25 of 53 Page 1

Account for the following:
(i) Primary amines (R-NH2) have higher boiling point than tertiary amines (R3N)
(ii) Aniline does not undergo Friedel – Crafts reaction.
(iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.

OR


Give the structures of A, B and C in the following reactions:




(i) Primary amines form inter molecular H – bonds, but tertiary amines don’t form H – bonds. So, primary amines have higher boiling points than the tertiary amines.


(ii) Aniline forms salt with Lewis acid AlCl3 and the Lewis acid AlCl3 is necessary for the Friedel crafts reaction to take place. So, aniline does not undergo Friedel crafts reactions.


(iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution. because of the combined effect of hydration and inductive effect (+I effect).


OR




More from this chapter

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23

(i) Write the IUPAC name of the complex [Cr(NH3)4Cl2]Cl.

(ii) What type of isomerism is exhibited by the complex [Co(en)3]3+?


(en= ethane-1,2-diamine)


(iii) Why is [NiCl4]2- paramagnetic but is [Ni(CO)4] is diamagnetic?


(Atomic No: Cr=24, Co=27,Ni=28)


 24

(a) Draw the structures of major monohalo products in each of the following reactions:


(b) Which halogen compound in each of the following pairs will react faster in SN2 reaction:
(i) CH3Br or CH3I


(ii) (CH3)3C-Cl or CH3-Cl


 26

Define the following terms as related to proteins:
(i) Peptide linkage
(ii) Primary structure
(iii) Denaturation

 27

On the occasion of World Health Day, Dr. Satpal organized a ‘health camp’ for the poor farmers living in a nearby village. After check-up, he was shocked to see that most of the farmers suffered from cancer due to regular exposure to pesticides and many were diabetic. They distributed free medicines to them. Dr. Satpal immediately reported the matter to the National Human Rights Commission (NHRC). On the suggestions of NHRC, the government decided to provide medical care, financial assistance, setting up of super-speciality hospitals for treatment and prevention of the deadly disease in the affected villages all over India.

(i) Write the values shown by
(a) Dr. Satpal
(b) NHRC.
(ii) What type of analgesics are chiefly used for the relief of pains of terminal cancer?
(iii) Give an example of artificial sweetener that could have been recommended to diabetic patients.