NCERT Solution for Class Tenth Science Chapter 4
Carbon and its Compounds
CBSE NCERT Book Session-2022-2023
Intext Questions
Page No-11
Questions No-3
What will be the formula and electron dot structure of cyclopentane?
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Cyclopentane is a cyclic hydrocarbon with the molecular formula C₅H₁₀. It consists of a ring of five carbon atoms, each bonded to two hydrogen atoms. The electron dot structure (Lewis structure) of cyclopentane can be determined by following these steps:
1. Determine the Total Valence Electrons:
» Each carbon contributes 4 valence electrons, and each hydrogen contributes 1 valence electron.
» Total valence electrons for C₅H₁₀ = 5 × 4 +10 × 1= 30 electrons.
2. Arrange Atoms in a Ring:
. Arrange the five carbon atoms in a ring.
3. Connect Atoms with Single Bonds:
» Form single bonds between each carbon atom and its adjacent carbon atoms to create the cyclopentane ring.
4. Distribute Remaining Electrons:
» Distribute the remaining electrons around the carbon atoms to satisfy the octet rule.
5. Check for Octet Rule:
» Ensure that each carbon atom in the ring has a full outer shell of 8 electrons.
The electron dot structure for cyclopentane (C₅H₁₀) is as follows:
H H
\ /
C─C─C─C─C
/
H
In this structure, each carbon atom is bonded to two hydrogen atoms, and the carbon atoms are connected by single bonds in a cyclical arrangement. The octet rule is satisfied for each carbon atom in the cyclopentane ring.