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Chemistry [2 Mark Question Answer]

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

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[2 Mark Question Answer]

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Question 12 Marks
How many isomers of the following hydrocarbons are possible?
(a)$ C_3H_8$
(b) $C_4H_{10}$​​​​​​​
Answer
(a) $C_3H_8 -$ Zero isomers. Alkanes with more than three carbon atoms form isomers.
(b)$ C_4H_{10}$​​​​​​​- Two isomer
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Question 22 Marks
Write the molecular formulae of the third and fifth members of homologous series represented by general formula $C_nH_{2n-2}.$
Answer
As the general formula of the homologous series is $C_nH_{2n-2}$​​​​​​​ so they represent Alkynes.
Third member: $C_4H_6​​​​​​​$​​​​​​​
Fifth member: $C_6H_{10}​​​​​​​$​​​​​​​
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Question 32 Marks
Give the names of the following functional groups:
-OH, >- c = o, -CHO, -COOH
Answer
The names of the functional groups are:
-OH : alcohol
>- c = o : Ketone
-CHO : Aldehyde
-COOH : Carboxylic acid
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Question 42 Marks
Give the name and formulae of one member of each of the following:
(a) Saturated hydrocarbons
(b) Unsaturated Hydrocarbons
Answer
The name and formulae of one member of each of following are:
(a) Saturated hydrocarbons
Formulae : $CH_4$​​​​​​​
Name : Methane
(b) Unsaturated Hydrocarbons
Formulae : $C_2H_4​​​​​​​$​​​​​​​
Name : Ethene
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