Short Answer TypeGive reasons:
The presence of nitro group (–NO2) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.
Mr. Roy, the principal of one reputed school organized a seminar in which he invited parents and principals to discuss the serious issue of diabetes and depression in students. They all resolved this issue by strictly banning the junk food in schools and to introduce healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour physical activities for the students in the morning assembly daily. After six months, Mr. Roy conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students.
After reading the above passage, answer the following:
(i) What are the values (at least two) displayed by Mr. Roy?
(ii) As a student, how can you spread awareness about this issue?
(iii) What are tranquillizers? Give an example.
(iv) Why is use of aspartame limited to cold foods and drinks?
(i) The values displayed by Mr. Roy are:
(ii) Awareness regarding diabetes and depression among students can be spread by conducting seminars, health camps, debates, distribution of pamphlets, organising workshops by doctors, etc. to highlight the need to follow healthy eating habits and importance of physical activity in the day to day life of students.
(iii) Tranquillisers are those class of organic compounds that are neurologically active drugs. They perform their function by inhibiting the message transfer mechanism from nerve to receptor. They induce a sense of well-being and are used in the treatment of stress, anxiety, irritability and mental diseases. For example, chlordiazepoxide, iproniazid, phenelzine, meprobamate, Equanil, etc.
(iv) Use of aspartame is limited to cold food and drinks because it is unstable at temperatures achieved during cooking of food.
Write the structures of main products when aniline reacts with the following reagents:
(i) Br2 water
(ii) HCl
(iii) (CH3CO)2O/pyridine
Arrange the following in the increasing order of their boiling point: C2H5NH2, C2H5OH, (CH3)3N
Give a simple chemical test to distinguish between the following pair of compounds:
(CH3)2NH and (CH3)3N.
Long Answer TypeFor the hydrolysis of methyl acetate in aqueous solution, the following results were obtained:
|
t/s |
0 |
30 |
60 |
|
[CH3COOCH3] / mol L–1 |
0.60 |
0.30 |
0.15 |
(i) Show that it follows pseudo-first order reaction, as the concentration of water remains constant.
(ii) Calculate the average rate of reaction between the time intervals 30 to 60 seconds.
(Given log 2 = 0.3010, log 4 = 0.6021)
(i) Which allotrope of phosphorus is more reactive and why?
(ii) How the supersonic jet aeroplanes are responsible for the depletion of ozone layers?
(iii) F2 has lower bond dissociation enthalpy than Cl2. Why?
(iv) Which noble gas is used in filling balloons for meteorological observations?
(v) Complete the equation: XeF2 + PF5 →
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