NCERT GRADE 12 SCIENCE

  Unit 7: Alcohols, Phenols and Ethers PART 3 Multiple Choice Questions (MCQs) Q1. According to the common system, the name of an alcohol is derived from: (a) the common name of the alkane (b) the common name of the alkyl group followed by the word "alcohol" (c) the IUPAC name of the alkane (d) the common name of the alkyl group followed by the word "hydroxide" Ans: (b) the common name of the alkyl group followed by the word "alcohol" Q2. What is the common name of CH₃OH? (a) Methanol (b) Methyl alcohol (c) Methanal (d) Formic alcohol Ans: (b) Methyl alcohol Q3. According to the IUPAC system, the name of an alcohol is derived by substituting the terminal 'e' of the alkane with: (a) '-al' (b) '-one' (c) '-ol' (d) '-oic acid' Ans: (c) '-ol' Q4. In the IUPAC naming of alcohols, the longest carbon chain is numbered starting from the end nearest to the: (a) alkyl group (b) hydroxyl group (c) double bond (d)...

  Unit 7: Alcohols, Phenols and Ethers PART 2 Multiple Choice Questions (MCQs) Q1. Alcohols and phenols are classified as mono-, di-, tri-, or polyhydric depending on: (a) the type of carbon atom they are attached to (b) the number of hydroxyl groups present in their structure (c) the presence of a double bond (d) the presence of an aromatic ring Ans: (b) the number of hydroxyl groups present in their structure Q2. Glycerol (propane-1,2,3-triol) is an example of which type of alcohol? (a) Monohydric (b) Dihydric (c) Trihydric (d) Polyhydric Ans: (c) Trihydric Q3. In a primary alcohol, the –OH group is attached to a: (a) primary carbon atom (b) secondary carbon atom (c) tertiary carbon atom (d) vinylic carbon atom Ans: (a) primary carbon atom Q4. An allylic alcohol is one in which the –OH group is attached to a: (a) sp³ hybridised carbon next to an aromatic ring (b) sp³ hybridised carbon adjacent to a carbon-carbon double bond (c) sp² hybridised carbon of a double bond (d) pr...

  Unit 7: Alcohols, Phenols and Ethers PART 1 Multiple Choice Questions (MCQs) Q1. Alcohols and phenols are formed when a hydrogen atom in a hydrocarbon is replaced by: (a) –CHO group (b) –OH group (c) –O– group (d) –COOH group Ans: (b) –OH group Q2. In an alcohol, the –OH group is directly attached to the carbon atom of: (a) an aromatic system (b) an aliphatic system (c) a heterocyclic ring (d) a benzene ring Ans: (b) an aliphatic system Q3. In a phenol, the –OH group is directly attached to the carbon atom of: (a) an aliphatic chain (b) an aromatic system (c) an alkane (d) an ether Ans: (b) an aromatic system Q4. The ordinary spirit used for polishing wooden furniture is chiefly: (a) methanol (b) phenol (c) ethanol (d) dimethyl ether Ans: (c) ethanol Q5. Which of the following is the formula of dimethyl ether? (a) CH₃OH (b) C₆H₅OH (c) CH₃OCH₃ (d) CH₃CH₂OH Ans: (c) CH₃OCH₃ Q6. Ethers are formed by substituting the hydrogen atom of the hydroxyl group of an alcohol or phe...