Question 11 markVery Short AnswerSection A

Write the name and formula of the second member of the carbon compounds having functional group - OH.

Carbon and its Compounds
Functional Groups in Carbon Compounds

Official answer

The functional group −OH-OH represents the alcohol class of compounds.


  • Name of the second member: Ethanol
  • Chemical formula: CH3CH2OHCH_3CH_2OH (or C2H5OHC_2H_5OH)
Answer keywords:EthanolCH3CH2OHCH_3CH_2OHC2H5OHC_2H_5OHalcoholsecond member

Marking scheme

  1. 1.Correct name of the second member (Ethanol) (0.5 marks)
  2. 2.Correct chemical formula (CH3CH2OHCH_3CH_2OH or C2H5OHC_2H_5OH) (0.5 marks)

Hint

The first member of this series contains one carbon atom (Methanol). The second member must contain two carbon atoms.

Quick oral answer

Q: What is the functional group present in ethanol? A: The functional group present in ethanol is the hydroxyl group, represented as −OH-OH.

Common mistakes

  1. 1.Writing Methanol (CH3OHCH_3OH) instead of Ethanol, confusing the first member with the second.
  2. 2.Writing an incorrect formula such as C2H6OHC_2H_6OH instead of C2H5OHC_2H_5OH.

Analysis and explanation

The general formula for the alcohol homologous series is CnH2n+1OHC_nH_{2n+1}OH.

  • For the first member (n=1n = 1), the formula is CH3OHCH_3OH (Methanol).
  • For the second member (n=2n = 2), the formula is C2H5OHC_2H_5OH or CH3CH2OHCH_3CH_2OH (Ethanol).

Interesting facts

Ethanol is a versatile solvent and is the active ingredient in all alcoholic beverages, as well as a key component in hand sanitizers and biofuels.

Question details

Q1 of 41 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2012
Section
Section A
Marks
1
Type
Very Short Answer
Chapter
Carbon and its Compounds
Topic
Functional Groups in Carbon Compounds
Bloom's level
Remembering
Syllabus topic
Functional groups in carbon compounds (containing halogens, oxygen, nitrogen and sulphur)

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Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2012?

This question carries 1 mark in the CBSE Class 10 Science 2012 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Carbon and its Compounds" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Functional Groups in Carbon Compounds" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2012 paper?

This is a Very Short Answer question from Section A in the CBSE Class 10 Science 2012 paper.