Covalent Bonding in Carbon

Q.

Pentane has the molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{12}$. It has?

1. $5$ covalent bonds

2. $12$covalent bonds

3. $16$ covalent bonds

4. $17$ covalent bonds

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Explain the formation of carbon dioxide molecule with help of electron dot diagram. [3 Marks]

Q. Assertion (A): Although hydrogen is a potential source of heat energy, it is not used as a domestic fuel.

Reason (R): Hydrogen gas burns with an explosion.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. Both (A) and (R) are false.
4. (A) is true but (R) is false.