Ethane, with the molecular formula C2H6, has
(a) 6 covalent bonds
7 covalent bonds
(c) 8 covalent bonds
(d) 9 covalent bonds.

AcademicChemistryNCERTClass 10

Correct Answer: (b) 7 covalent bonds

Explanation: Ethane, with the molecular formula C2H6, has 7 covalent bonds. The structural formula of ethane (C2H6) is given below:

NCERT Solutions for Class 10 Science Chapter 4 Carbon and its Compounds MCQs Q13

[Extra information: A homologous series is a group of organic compounds having similar structures and similar chemical properties in which the successive compounds differ by -CHgroup. The molecular formula of the 2nd and the 3rd member of the homologous series whose first member is methane are: Ethane (C2H6) and Propane (C3H8).

Example: All the alkanes have similar structures with single covalent bonds and show similar chemical properties, so they can be grouped together in the form of a homologous series.

The hydrocarbons which are members of the same homologous series are:

Alkanes: C3H8, C4H10

Alkenes: C5H10, C8H16

Alkynes: C6H10, C7H12

Uses: Ethane has a large range of applications. It is the second most abundant natural gas component and is used in many homes. It is also used for the production of ethylene, which is used in the manufacture of goods such as plastic, automotive antifreeze, and detergent.]

Updated on 10-Oct-2022 12:47:16