Author: Dr. Vikas Jasrotia

Practice Questions (Answers) Haloalkanes and Haloarenes Practice Questions (Answers) Haloalkanes and Haloarenes Ans 1. CH3 — CH2 — CH2 Br →alc. KOH→ CH3 — CH = CH2 + KBr + H2O Ans 2. Ethyl chloride reacts with alcoholic AgNO3 to give white ppt. of AgCl. Vinyl chloride does not give this test. CH3 — CH2 — Cl + AgNO3 + C2H5OH → AgCl¯ + CH3CH2OCH2CH3 + HNO3 Ans 3. A poisonous gas called phosgene (COCl2) is formed. Ans 4. Free radical substitution occurs at the methyl group giving first benzyl chloride and finally benzo trichloride. Ans 5. By using the…

Practice Questions Haloalkanes and Haloarenes Practice Questions Haloalkanes and Haloarenes 1. What happens when n-propyl bromide is treated with alcoholic KOH? 2. How will you distinguish between ethyl chloride and vinyl chloride? 3. What happens when chloroform is exposed to light and air? 4. What happens when chloride is passed through boiling toluene in the presence of sunlight? 5. How will you bring about the conversion: methyl bromide to methyl iodide? 6. Write the structure and name of the compounds formed when compound ‘A’ with molecular formula is treated within the presence of FeCl3 7. Write the chemical in which…

Practice Questions (Answers) Chapter 11 Class 12 Chemistry Practice Questions (Answers) Chapter 11 Class 12 Chemistry Ans 1. It is due to the poor intermolecular force of attraction. Ans 2. The lone pair on the methoxy group oxygen is more available for participating in resonance into the ring than the lone pair on hydroxyl oxygen due to the +I effect of the methyl group. Ans 3. Ionization of alcohol is represented by ROH + H2O ↔ RO- + H3O+ the negative charge in the alkoxide ion is localized on the oxygen atom. In the case of phenoxide ion, the negative charge on…

Practice Questions Chapter 11 Class 12 Chemistry Practice Questions Chapter 11 Class 12 Chemistry 1. Why ethers are more volatile? 2. Phenol is more reactive towards electrophilic substitution than methoxybenzene, explain 3. Phenols are more acidic than alcohol. Explain. 4. Phenols do not react with NaHCO3 while nitrophenols react, why? 5. How 1°, 2°, 3° alcohols can be distinguished? 6. What is Reimer- Tieman reaction? Why does this reaction yields ortho isomer as a major product? 7. Write a note on Kolbe’s reaction. 8. How phenol can be converted into benzene? 9. Write the products of the given reaction? 10.…

Compound A (C6H12O2) on reduction with LiAlH4 Compound A (C6H12O2) on reduction with LiAlH4 Que. A compound A (C6H12O2) on reduction with LiAlH4 yielded two compounds B and C. The compound B on oxidation gave D which on treatment with aq. alkali and subsequent heating furnished E. The later catalytic hydrogenation gave C. Compound D was oxidized further to give F which was found to be a monobasic acid (mol. wt. = 60) find the structures of A, B, C, D, E, and F. Ans. Upon reduction with LiAlH4, compound A (C6H12O2) gives two compounds, hence it must be an…

C—O bond length in RCOOH Que. Explain the following giving proper reasoning: (a) C—O bond length in RCOOH is shorter than in ROH (b) Highly branched carboxylic acids are less acidic than unbranched acids Ans. (a) RCOOH has the following resonance structure Because of the contribution of structure (b), there is some double-bond character in the C—O bond of the acid. Therefore C—O bond length is shorter than R—OH which has a pure single bond character. (b) The carboxylate ion (RCOO–) of branched-chain acids is shielded from solvent molecules and can not be stabilized by solvation as effectively as the…

Coordination Compounds Assertion Reason Questions Coordination Compounds Assertion Reason Questions (a) Assertion and reason both are correct and the reason is the correct explanation of assertion. (b) Both assertion and reason are true but the reason is not the correct explanation of assertion. (c) Assertion is correct but Reason is incorrect (d) Assertion is a wrong statement but the reason is a correct statement (e) Both Assertion and Reason are incorrect 1. Assertion: Toxic metal ions are removed by the chelating ligands. Reason: Chelate complexes tend to be more stable. Ans 1. (a) Assertion and reason both are correct and…

d and f Block Elements Assertion Reason Questions d and f Block Elements Assertion Reason Questions (a) Assertion and reason both are correct and the reason is the correct explanation of assertion. (b) Both assertion and reason are true but the reason is not the correct explanation of assertion. (c) Assertion is correct but Reason is incorrect (d) Assertion is a wrong statement but the reason is a correct statement (e) Both Assertion and Reason are incorrect Q 1. Assertion: Members of the 4d and 5d series of transition elements have nearly the same atomic radii. Reason: Atomic and ionic radii for transition elements are…

Properties and Structure of XeF2 Properties and Structure of XeF2 Xenon difluoride is a compound with the formula XeF2. This compound is the most stable compound of Xenon. It is a powerful fluorinating as well as an oxidizing agent. It is also a moisture-sensitive fluoride and reacts to form hydrofluoric acid. It decomposes both in water vapour and light. The oxidation state of xenon in Xenon Difluoride is +2. Apart from XeF2, there are other Xenon compounds such as XeF4 (Xenon Tetrafluoride) and XeF6 (Xenon Hexafluoride). Properties of Xenon Difluoride: 1. It is a white crystalline solid. 2. It has…

p-Block Elements Assertion Reason Questions p-Block Elements Assertion Reason Questions Q 1. Assertion: Hydrolysis of XeF6 is an example of a redox reaction. Reason: XeF6 when hydrolysed yields XeOF4 and XeO2F2 Ans 1. (d) Assertion is wrong but the reason is the correct statement Q 2. Assertion: The O-O bond length in ozone is identical to that in molecular oxygen. Reason: The ozone molecule is a resonance hybrid of two canonical structures. Ans 2. (a) Both A and R are true but R is the correct explanation of A Q 3. Assertion: HI cannot be prepared by the action of…