1 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 $-OH$ represents the alcohol class of compounds.

Ethanol

CH_3CH_2OH

C_2H_5OH

alcoholsecond member

Marking Scheme

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 $-OH$ .

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

For the first member ( $n = 1$ ), the formula is $CH_3OH$ (Methanol).
For the second member ( $n = 2$ ), the formula is $C_2H_5OH$ or $CH_3CH_2OH$ (Ethanol).

1Writing Methanol ( $CH_3OH$ ) instead of Ethanol, confusing the first member with the second.
2Writing an incorrect formula such as $C_2H_6OH$ instead of $C_2H_5OH$ .

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.

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

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

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

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