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Chemistry [3 Mark Question Answer]

11.1 Organic Compounds · ICSE STD 10 (ICSE - English Medium). 4 questions.

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[3 Mark Question Answer]

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Question 13 Marks
What is the difference in molecular formula of any Two adjacement homologues in terms of types of atoms and molecular mass?
Answer
The difference in molecular formula of any two adjacent homologues in terms of types of atoms is that that they differ by $CH_2$​​​​​​​ group i.e. by one carbon atom and two hydrogen atom.
The difference in the molecular masses of any two adjacent homologues is
14.
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Question 23 Marks
Define a functional group with two examples. write the Functional groups for
(i) Alcohol
(ii) Ketone
(iii) Carboxylic acid
Answer
A functional group may be defined as an atom or group of atoms present in a molecule which largely determines its chemical properties.
For Example: -OH- Alcohol, -CHO- Aldehyde
Functional group of:
(i) Alcohol: -OH
(ii) Ketone: >C=O
(iii) Carboxylic acid: -COOH
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Question 33 Marks
Define a functional group with two examples. write the Functional groups for
(i) Alcohol
(ii) Ketone
(iii) Carboxylic acid
Answer
A functional group may be defined as an atom or group of atoms present in a molecule which largely determines its chemical properties.
For Example: -OH- Alcohol, -CHO- Aldehyde
Functional group of:
(i) Alcohol: -OH
(ii) Ketone: >C=O
(iii) Carboxylic acid: -COOH
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Question 43 Marks
What is eaten ation? Why carbon shovv rnaximurn tendency of catenation?
Answer
Carbon has the unique property of combining any number of carbon atoms
to form straight chains, branched chains and rings of different sizes.
Carbon show maximum tendency of catenation due to:
(i) Tetra covalency of carbon and
(ii) Great strength of carbon- carbon bonds.
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