CBSE Class 12 Chemistry Alcohols Phenole And Ethers (1). 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.
Chapter 11 to 16
ALCOHOLS, PHENOLS AND ETHERS.
Q.1 Give the IUPAC name of the following.
CH3-C (CH3) =CH-CH2OH
Ans:-3-Methyl But-2-en 1-ol
Q.2 Phenols are much more acidic than alcohols. Why
Ans:-Due to electron with drowning nature of ph-group.
Q3 Give the IUPAC name of the following compound:
2 − Bromo-3-methyl-but-2-ene-1-ol.
Q.4 What happen when phenol is treated with excess of bromine(aq).
Ans It gives 2,4,6-tribromo phenol.
Q.5 Write chemical equation Williamson synthesis.
Ans- R-X+R- O- Na ---------→ R-O-R + NaCl
Q.6 Mention one uses of methanol.
Ans – (i) As a denaturant for ethanol
Q.7 The boiling point of ethanol is higher than that methoxy methane.
Ans-Ethanol has inter molecular hydrogen bonding, methoxymehane does not have H-bonding.
Q.8 Name a substance that can be used as an antiseptic as well as a disinfectant.
Ans: Phenol can be used as an antiseptic as well as a disinfectant. 0.1% Soln of phenol is used as an antiseptic & 1% Soln of phenol is used as a disinfectant.
Q.9 Write the IUPAC name.
Q.10 What is Nucleophiles.
Ans- The species which has high electrons density.
Q.11 Which catalyst are used in Friedel craft reaction?
Q.12 Write a test to distinguish between primary, secondary and alcohols?
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