Direction: In the following questions a statement of Assertion (A) fo...
Hybridization of C can be calculated by counting p bonds and σ bonds present on C atom. If C has 3σ bonds, it is sp2 hybridized. If C has 2σ bonds, it is sp hybridized.
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Direction: In the following questions a statement of Assertion (A) fo...
Assertion (A): All the carbon atoms in H2C=C=CH2 are sp2 hybridized
Reason (R): In this molecule, all the carbon atoms are attached to each other by double bonds.
The correct answer is option D, which states that Assertion (A) is not correct but Reason (R) is correct.
Explanation:
- Sp2 hybridization in carbon atoms:
- In H2C=C=CH2, there are three carbon atoms bonded to each other by double bonds.
- Carbon can hybridize its atomic orbitals to form bonding orbitals with other atoms.
- In sp2 hybridization, one s orbital and two p orbitals of carbon combine to form three sp2 hybrid orbitals.
- These sp2 hybrid orbitals are oriented in a trigonal planar arrangement around the carbon atom.
- Each sp2 hybrid orbital overlaps with an orbital from another atom to form a sigma bond.
- In H2C=C=CH2, each carbon atom is sp2 hybridized and forms a sigma bond with two other carbon atoms.
- Double bonds in H2C=C=CH2:
- The presence of double bonds in H2C=C=CH2 indicates that each carbon atom is bonded to two other carbon atoms.
- A double bond consists of one sigma bond and one pi bond.
- The sigma bond is formed by the overlap of sp2 hybrid orbitals, while the pi bond is formed by the overlap of unhybridized p orbitals.
- In H2C=C=CH2, each carbon atom forms a sigma bond with two other carbon atoms and a pi bond with one other carbon atom.
- Analysis of Assertion and Reason:
- The Reason (R) is correct because all the carbon atoms in H2C=C=CH2 are indeed attached to each other by double bonds.
- However, the Assertion (A) is not correct because not all the carbon atoms in H2C=C=CH2 are sp2 hybridized.
- The carbon atoms at the ends of the molecule are sp3 hybridized, as they are each bonded to three other atoms (two carbon atoms and two hydrogen atoms).
- Only the central carbon atom in H2C=C=CH2 is sp2 hybridized, as it is bonded to three other atoms (two carbon atoms and one hydrogen atom).
- Therefore, the correct answer is option D, which states that Assertion (A) is not correct but Reason (R) is correct.
In conclusion, while the Reason (R) correctly explains the presence of double bonds in H2C=C=CH2, the Assertion (A) is not accurate as not all the carbon atoms in the molecule are sp2 hybridized.
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