Compound C-C bond type (i) Ethane (a) Double bond (ii) Ethene (b) Single bond (iii) Ethyne (c) Triple bond
Understanding Carbon-Carbon Bonds in Hydrocarbons
This question asks us to correctly match three simple hydrocarbons—Ethane, Ethene, and Ethyne—with the type of carbon-carbon bond they contain. Let's break down each compound to understand its bonding structure.
Compound (i): Ethane
Ethane is an alkane with the chemical formula $C_2H_6$. Its structural formula is $CH_3-CH_3$. In ethane, the two carbon atoms are joined by a **single covalent bond**. This type of bond involves the sharing of one pair of electrons between the two carbon atoms.
Compound (ii): Ethene
Ethene, also known as ethylene, is an alkene with the chemical formula $C_2H_4$. Its structural formula is $CH_2=CH_2$. In ethene, the two carbon atoms are joined by a **double covalent bond**. This bond consists of two pairs of shared electrons between the carbon atoms. One of these is a sigma bond, and the other is a pi bond.
Compound (iii): Ethyne
Ethyne, commonly called acetylene, is an alkyne with the chemical formula $C_2H_2$. Its structural formula is $CH \equiv CH$. In ethyne, the two carbon atoms are linked by a **triple covalent bond**. This involves the sharing of three pairs of electrons between the two carbon atoms (one sigma bond and two pi bonds).
Matching Compounds and Bond Types
Based on the analysis above, we can establish the correct matches:
- Ethane (i) has a Single bond (b).
- Ethene (ii) has a Double bond (a).
- Ethyne (iii) has a Triple bond (c).
Therefore, the correct sequence is i-b, ii-a, iii-c.
Summary Table
| Compound | Bond Type |
|---|---|
| (i) Ethane | (b) Single bond |
| (ii) Ethene | (a) Double bond |
| (iii) Ethyne | (c) Triple bond |
Important Questions from Chemistry
Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R).
Assertion (A): Copper wire in iron sulphate solution shows no visible reaction.
Reason (R): Copper is less reactive than iron.Which of the following statements are correct?
(i) Solid $CO_2$ is called dry ice.
(ii) Solid $CO_2$ changes directly into gas at 1 atm pressure.
(iii) Pressure and temperature can change the state of matter.
(iv) Solid $CO_2$ melts into liquid $CO_2$ before becoming gas.- Which of the following are compressed gases commonly used in daily life? (i) LPG for cooking (ii) Oxygen in hospitals (iii) CNG in vehicles (iv) Water in bottles
- The rate of evaporation increases with:
i. an increase in surface area
ii. an increase in temperature
iii. a decrease in humidity - Select the option that is true regarding the following two statements labelled Assertion (A) and Reason (R).
Assertion (A): In electrolytic refining, insoluble impurities settle down at the bottom of the anode.
Reason(R): These impurities do not dissolve in the electrolyte.
