Q21 of 26 Page 1

Predict the products of the following reactions:

(i)


(ii)


(iii)


(i)

On treating propene with diborane, each hydrogen in borane is replaced by propyl group. Then on treating with hydrogen peroxide and aqueous sodium hydroxide the compound gets oxidized to alcohol.


(ii)


On treating phenol with bromine water it undergoes halogenation reaction to result in a white precipitate 2,4,6-tribromophenol.


(iii)


Vapours of primary alcohol when passed over heated cooper, dehydrogenation takes place (removal of hydrogen) which results in an aldehyde. Similarly secondary alcohol results in a ketone.


More from this chapter

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19

How do you convert the following:

(i) Benzoic acid to Benzaldehyde


(ii) Ethyne to Ethanal


(iii) Acetic acid to Methane


OR


Write the equations involved in the following reactions:


(i) Stephen reaction


(ii) Wolff-Kishner reaction


(iii) Etard reaction


 20

(a) How would you account for the following:

(i) Highest fluoride of Mn is MnF4 whereas the highest oxide is Mn2O7.


(ii) Transition metals and their compounds show catalytic properties.


(b) Complete the following equation:


3 MnO42- + 4 →


 22

An element X (molar mass = 60 g mol-1) has a density of 6.23 g cm-3. Identify the type of cubic unit cell, if the edge length of the unit cell is 4× 10-8 cm.

 23

Seeing the growing cases of diabetes and depression among children, Mr. Chopra, the principal of one reputed school organized a seminar in which he invited parents and principals. They all resolved this issue by strictly banning the junk food in schools and by introducing healthy snacks and drinks like soup, lassi, milk, etc. in school canteens. They also decided to make compulsory half an hour physical activity for the students in the morning assembly daily. After six month, Mr. Chopra 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 questions;


(i) What are the values (at least two) displayed by Mr. Chopra?


(ii) As a student, how can you spread awareness about this issue?


(iii) Why should antidepressant drugs not be taken without consulting a doctor?


(iv) Give two examples of artificial sweetners.