Chemical Properties of Phenols

Q.

When chlorine gas is passed through an aqueous solution of potassium bromide, the solution turns brown due to the liberation of

1. chlorine

2. oxygen

3. bromine

4. iodine

Q.

Give one example of oxidation when loss of hydrogen takes place and write a chemical equation in support of your answer.

Q. In which case, van’t Hoff factor i remains unchanged ? (a) PtCl4 reacts with aq. KCl (b) aq. ZnCl2 reacts with aq. NH3 (c) aq. FeCl3 reacts with aq. K4 [Fe(CN)]6 (d) KMnO4 reduced to MnO2 in alkaline medium

Q. cyclohexene reaction with HBr in presence of CCl4

Q. which is more acidic among cyclohexane carboxylic acid and ethanoic acid?

Q.

The colour developed by the addition of few drops of methyl orange to aqueous solution of sodium acetate

1. orange

2. pink

3. colourless

4. yellow

Q. Ph- CH(CH3)-Cl = in presence of (CH3COOH) Above reaction is known as 1. Methanolysis 2. Ethanolysis 3. Acetolysis 4. Formalysis

Q. 16. Explain exitation potential and ionization potential?

Q. Which of the following pair of compounds can be separated by aq. $NaHC{O}_3$?

1. Phenol and benzyl alcohol
2. Benzoic acid and Picric acid
3. p-Nitrophenol and p-Methoxyphenol
4. Resorcinol and o-Cresol

Q. In zn and H2SO4 reaction how grams of 80% pure zn is needed to produce 10 grams of H2?

Q. 77 1g of Ethyl alcohol and 1g mole of acetic acid are mixed. At equilibrium 0.666 g mole of the ester is present. The value of equilibrium constant will be

Q. why the dipole moment of vinyl chloride increases due to the resonance effect?

Q. number of isomers for benzoic acid

Q. Out of ch3cook and ch3cooh which is more acidic and why?

Q. For a reaction △ G^{o }is -10J/mol then what is K_{eq} for the reaction?

Q. What is the meaning of bomb caloriemeter?

Q. What is the meaning of degree of unsaturation and what is the degree of unsaturation for allyl vinyl acetylene?

Q. Compare the properties of two isomeric products x and y formed in the following reaction.

1. Acid strength - y > x, $H_{2}O$ solubility - y > x, Volatility - x > y, Melting point - y > x
2. Acid strength - x > y, $H_{2}O$ solubility - x > y, Volatility - y > x, Melting point - x > y
3. Acid strength - y > x, $H_{2}O$ solubility - x > y, Volatility - y > x , Melting point - y > x
4. Acid strength - x > y, $H_{2}O$ solubility - y > x, Volatility - x > y, Melting point - y > x

Q. Identify the product in following reaction.

1. 
2. 
3. 
4. 

Q. full form of :-)1.))ccl4 2.cf4 3.h2co3 4.h2co3 minu

Q. When phenol is treated with excess of bromine water, it gives

1. m-bromophenol
2. o-and p-bromophenol
3. 2, 4-dibromophenol
4. 2, 4, 6-tribromophenol

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c)If assertion is true but reason is false.
(d)If assertion is false but reason is true.

Assertion: Phenol is more reactive than benzene towards electrophilic substitution reaction.
Reason : In the case of phenol, the intermediate phenoxide is more resonance stabilized.

1. A
2. B
3. C
4. D

Q.

If the difference in boiling points of two liquids is not much we employ:

1. Paper chromatography

2. Differential extraction

3. Fractional Distillation

4. Steam distillation

Q. Benzene can be obtained from phenol by heating it with ___.

1. NaNO₂/HCl at 0-5 °C

2. bromine water
3. zinc dust

4. H₃PO₃/H₂O

Q. is sp^2 hybridiazation is sure characterstic of a planer molecule ?

Q. 22. Which of the following reaction is incorrect ? (1) KBr3 + I2 → KI3 + Br2 (2) KCl3 + F2→ KF3 + Cl2 (3) KBr3 + Cl2 → KCl3 + Br2 (4) Li2O + KCl → K2O + LiCl

Q. Define reaction with NBS in detail

Q. What are the 4 types of forces which make chemical bond?

Q.

The structure of the compound that gives a tribromo derivative with bromine water is:

1. 

2. 

3. 

4. 

Q. Bromination of phenol using bromine water produces ____.

1. 2-bromophenol
2. 4-bromophenol
3. 2, 6-dibromophenol
4. 2, 4, 6-tribromophenol