Q26 of 26 Page 1

(a) Write the major product(s) in each of the following reactions:


(b) Write the chemical reaction involved in the following reactions:


(i) Kolbe’s reaction


(ii) Friedal-Crafts acetylation of anisole


OR


(a) What happens when


(i) Phenol reacts with Bromine water?


(ii) Ethanol reacts with CH3COCl/pyridine?


(iii) Anisole reacts with HI?


Write the chemical equations involved in the above reactions.


(b) Distinguish between:


(i) Ethanol and phenol


(ii) Propan-2-ol and 2-methylpropan-2-ol


(a)


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(b)


(i) Phenoxide ion is generated by treating phenol with sodium hydroxide which is even more reactive than phenol towards electrophilic aromatic substitution. Hence, it undergoes electrophilic substitution with carbon dioxide which is a weak electrophile. Ortho hydroxybenzoic acid is formed as the main reaction product.



(ii) Anisole undergoes Friedel-Crafts acylation, i.e., acyl groups are introduced at ortho and para positions by reaction with acyl halide in the presence of anhydrous aluminium chloride (a Lewis acid) as catalyst.



OR


(a)(i)


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(ii)


(iii)


ii.png


(b) (i) Ethanol and phenol


Phenol gives a violet coloration with FeCl3 solution but ethanol does not.



(ii) Propan-2-ol and 2-methylpropan-2-ol


Propan-2-ol when warmed with NaOI (I2/NaOH) gives yellow precipitate of iodoform while 2-methylpropan-2-ol does not.



More from this chapter

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22

Write the major product(s) in the following reactions:


 23

Due to hectic and busy schedule, Mr. Awasthi made his life full of tensions and anxiety. He started taking sleeping pills to overcome the depression without consulting the doctor. Mr. Roy, a close friend of Mr. Awasthi, advised him to stop taking sleeping pills and suggested to change his lifestyle by doing Yoga, meditation and some physical exercise. Mr. Awasthi followed his friend’s advice and after few days he started feeling better.

After reading the above passage, answer the following:


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


(ii) Why it is not advisable to take sleeping pills without consulting doctor?


(iii) What are tranquilizers? Give two examples.


 24

(a) Calculate ∆G° and log Kc for the following reaction at 298 K:

2Cr(s) + 3Fe2+(aq) → 2Cr3+(aq) + 3Fe(s)


Given: E°cell = 0.30 V


(b) Using the E° values of A and B, predict which is better for coating the surface of iron [E° (Fe2+|Fe) = –0.44 V] to prevent corrosion and why?


Given: E°(A2+|A) = –2.37 V : E°(B2+|B) = –0.14 V


OR


(a) The conductivity of 0.001 mol/L solution of CH3COOH is 3.905 × 10-5 S/cm. Calculate its molar conductivity and degree of dissociation.


Given: λ° (H+) = 349.6 S cm2 mol-1 and λ° (CH3COO-) = 40.9 S cm2 mol-1.


(b) What type of battery is lead storage battery? Write the overall reaction occurring in lead storage battery.


 25

(a) Account for the following:

(i) Mn2O7 is acidic whereas MnO is basic.


(ii) Though copper has completely filled d-orbital (d10) yet it is considered as a transition metal.


(iii) Actinoids show wide range of oxidation states.


(b) Write the preparation of potassium permanganate from pyrolusite ore (MnO2).


OR


(a) The elements of 3d transition series are given as:



Answer the following:


(i) Which element has the highest m.p. and why?


(ii) Which element is a strong oxidizing agent in +3 oxidation state and why?


(iii) Which element is soft and why?


(b) Write the equations involved in the preparation of Potassium dichromate from Sodium chromate (Na2CrO4).