What is the molecular shape of c2hcl and is it polar or nonpolar?
The Correct Answer and Explanation is:
Correct Answer:
- Molecular Shape of C₂HCl: Trigonal planar (around the central atoms)
- Polarity: Polar
Detailed Explanation (≈300 words):
C₂HCl, also known as chloroethyne, is a compound with the molecular formula: HC≡C–Cl. It is derived from ethyne (acetylene), where one hydrogen atom is replaced with a chlorine atom. To understand its molecular shape and polarity, we need to examine its structure, geometry, and electronegativity differences.
1. Lewis Structure and Bonding:
- The molecule consists of two carbon atoms connected by a triple bond.
- One hydrogen atom is bonded to the first carbon (C1).
- The second carbon (C2) is bonded to a chlorine atom.
Structure:
H–C≡C–Cl
Each carbon makes four bonds:
- C1: One single bond to H and a triple bond to C2.
- C2: A triple bond to C1 and a single bond to Cl.
2. Molecular Shape (Geometry):
- Around each carbon atom, the electron geometry is linear due to the triple bond (sp hybridization).
- So, the entire molecule H–C≡C–Cl is linear in shape.
- There are no lone pairs on the carbon atoms to distort the geometry.
3. Polarity:
- To determine polarity, we examine the electronegativity of the atoms:
- H (2.1), C (2.5), Cl (3.0)
- The C–Cl bond is polar due to the difference in electronegativity between C and Cl.
- The C–H bond is considered weakly polar, but in this case, its effect is negligible compared to C–Cl.
Because of the asymmetric distribution of electrons (Cl is more electronegative and pulls electron density), the molecule has a net dipole moment, making C₂HCl a polar molecule.
Conclusion:
- The shape of C₂HCl is linear.
- The molecule is polar due to the unequal electron sharing between carbon and chlorine, resulting in a net dipole moment.