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NEET CHEMISTRYHydrocarbonsEasy

Question

The molecule among the following that has the hybridization sp2,sp2,sp, and spsp^2, sp^2, sp, \text{ and } sp from left to right atoms is:

A

HC≡C−C≡HHC \equiv C - C \equiv H

B

CH2=CH−C≡CHCH_2 = CH - C \equiv CH

C

CH2=CH−CH=CH2CH_2 = CH - CH = CH_2

D

CH2−CH=CH−CH3CH_2 - CH = CH - CH_3

Step-by-Step Solution

  1. Hybridisation Rules: The hybridisation of a carbon atom can be determined by the number of sigma (σ\sigma) bonds and lone pairs attached to it [NCERT 11th, Ch 12, Sec 12.3; NCERT 11th, Ch 4, Sec 4.6].
  • Carbon bonded to 4 atoms (4 single bonds) →sp3\rightarrow sp^3.
  • Carbon bonded to 3 atoms (1 double bond) →sp2\rightarrow sp^2.
  • Carbon bonded to 2 atoms (1 triple bond or 2 double bonds) →sp\rightarrow sp.
  1. Analyze Option B (CH2=CH−C≡CHCH_2 = CH - C \equiv CH):
  • C1 (Left): Forms a double bond with C2 and two single bonds with H. Steric number = 3. Hybridisation = sp2sp^2.
  • C2: Forms a double bond with C1, a single bond with C3, and a single bond with H. Steric number = 3. Hybridisation = sp2sp^2.
  • C3: Forms a single bond with C2 and a triple bond with C4. Steric number = 2. Hybridisation = spsp.
  • C4 (Right): Forms a triple bond with C3 and a single bond with H. Steric number = 2. Hybridisation = spsp.
  • Sequence: sp2,sp2,sp,spsp^2, sp^2, sp, sp. This matches the required sequence.
  1. Analyze Other Options:
  • Option A (HC≡C−C≡HHC \equiv C - C \equiv H): All carbons are triple-bonded →sp,sp,sp,sp\rightarrow sp, sp, sp, sp.
  • Option C (CH2=CH−CH=CH2CH_2 = CH - CH = CH_2): All carbons are double-bonded →sp2,sp2,sp2,sp2\rightarrow sp^2, sp^2, sp^2, sp^2.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Hydrocarbons. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYHydrocarbonsmoleculefollowinghybridization

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