CBSE Class 12 Chemistry Alcohols Phenole And Ethers (2). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers
Alcohols And Phenols
Q1. What is absolute alcohol ?
Ans: 100% C2H5OH is known as absolute alcohol.
Q2. What is rectified spirit ?
Ans:95% C2H5OH is known as rectified spirit.
Q3.Lower alcohols are soluble in water but higher alcohols are not soluble . Why?
Ans: Due to large Hydrocarbon part which hydrophobic.
Q4. Why ether is insoluble in water ?
Ans: Due to absence of HB.
Q5. How is alcohol made unfit for drinking purposes ?
Ans: By adding CH3OH , CuSO4 and Pyridine
Q6. Phenol is an acid but does not react with NaHCO3. Why?
Ans: Since Phenol feebly weak in nature.
Q7.Diethylether does not react with Na.Why ?
Ans: Due to absence of acidic Hydrogen (Active).
Q8.Propanol has higher B.P. than that of n-Butane. Why?
Ans : In propanol there is HBonding but in n-Butane there is no HBonding.
Q9. Mixture of o- &p-Nitrophenol is separated by Steam volatile . Why ?
Ans: Due to intramolecular HB in O-Nitrophenol.
Q10. Out ofo- &p-Nitrophenol which one is more volatile ?
Ans:O-Nitrophenol due to intramolecular HB.
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