Read the passage and answer any four questions.
A homologous series is a series of organic compounds that share the same functional group, are members of the same family, and exhibit comparable chemical characteristics. The homologous members of this series are distinguished from one another by the number of CH₂ units in the primary carbon chain
A. Which of the following compounds has chemical characteristics similar to butane?
(i) Butyne
(ii) Propene
(iii) Propyne
(iv) Pentane
B. In terms of molecular mass and the number of atoms of the element, two subsequent members of an alkane homologous series differ from one another as follows:
(i) 14 a.m.u and CH₂, respectively
(ii) 12 a.m.u and CH₃, respectively
(iii) 14 a.m.u and CH₃, respectively
(iv) 12a.m.u and CH₂, respectively
C. To which of the following homologous series does the compound $C H_{3} C H (O H) C H_{3}$ belong?
(i) Aldehydes
(ii) Alcohols
(iii) Ketones
(iv) Carboxylic acids
D. Which of the following is not a homologous series property?
(i) They show similar chemical properties.
(ii) They differ by 14 units of mass
(iii) They all contain a double bond
(iv) They can be represented by a general formula
E. What are the name and general formula of the second member of the homologous series with the general formula?
(i) Methane, $C H_{4}$
(ii) Ethane, $C_{2} H_{6}$
(iii) Ethene, $C_{2} H_{4}$
(iv) Ethyne, $C_{2} H_{2}$

Question

Read the passage and answer any four questions.
A homologous series is a series of organic compounds that share the same functional group, are members of the same family, and exhibit comparable chemical characteristics. The homologous members of this series are distinguished from one another by the number of CH₂ units in the primary carbon chain
A. Which of the following compounds has chemical characteristics similar to butane?
(i) Butyne
(ii) Propene
(iii) Propyne
(iv) Pentane
B. In terms of molecular mass and the number of atoms of the element, two subsequent members of an alkane homologous series differ from one another as follows:
(i) 14 a.m.u and CH₂, respectively
(ii) 12 a.m.u and CH₃, respectively
(iii) 14 a.m.u and CH₃, respectively
(iv) 12a.m.u and CH₂, respectively
C. To which of the following homologous series does the compound $C H_{3} C H (O H) C H_{3}$ belong?
(i) Aldehydes
(ii) Alcohols
(iii) Ketones
(iv) Carboxylic acids
D. Which of the following is not a homologous series property?
(i) They show similar chemical properties.
(ii) They differ by 14 units of mass
(iii) They all contain a double bond
(iv) They can be represented by a general formula
E. What are the name and general formula of the second member of the homologous series with the general formula?
(i) Methane, $C H_{4}$
(ii) Ethane, $C_{2} H_{6}$
(iii) Ethene, $C_{2} H_{4}$
(iv) Ethyne, $C_{2} H_{2}$

Infinity Learn · Accepted Answer

A. The chemical properties of pentane compounds are similar to butane. It has a role as a non-polar solvent and a refrigerant. The shape of pentane is linear, similar to that of butane, but with one more carbon atom.

Question Image

Structure of butane

Question Image

Structure of pentane

Hence the correct option is (iv) Pentane.

B. In terms of molecular mass, each successive member in a homologous series differs by the molecular mass of 14u from the preceding member. Whereas in terms of the number of atoms, two consecutive homologous differ by 1 carbon atom and 2 hydrogen atoms in their molecular formula.

Hence the correct option is (i)14 a.m.u and CH₂, respectively.

C. The compound Alcohol belongs $C H_{3} C H (O H) C H_{3}$ belongs to the alcohol homologous series because of the presence of the ‘ $O H$ ’ group.

Hence the correct option is (ii) Alcohol.

D. We know that the homologous series is a sequence of compounds which has the same functional group and the same chemical properties. They share the same general formula. Homologous series differ by a

$C H_{2}$ group and have a mass of $14$ units. From the properties, it is evident that all the compounds do not contain double bonds.

Hence, the correct option is (iii) They all contain double bonds.

E. The second member of this homologous series is Ethane, having the general formula $C_{2} H_{6}$ .

Hence, the correct option is (ii) Ethane, $C_{2} H_{6}$ .

Start JEE / NEET / Foundation preparation at rupees 99/day !!

Detailed Solution

hear from our champions

Get Expert Academic Guidance – Connect with a Counselor Today!