Chemistry Hydrocarbons ETEA 2024
PMDC Verified Question 4 of 65
The carbon atom carrying positive charge and attached to three other atoms or groups is called
A
Carbanion
B
Carbene
C
Carbocation
D
Oxonium
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Carbocation
Concept:

Organic reaction intermediates are classified based on the formal charge and number of bonds on the carbon atom.

Solution:

  • A carbon atom normally makes four bonds to achieve a complete octet.


  • If a carbon atom is attached to only three atoms/groups and lacks the fourth electron pair, it has an empty p-orbital and a formal charge of +1.


  • This positively charged, trivalent carbon species is definitively called a carbocation.


  • (Note: The provided source key incorrectly listed B; C is the universally accepted chemical fact.)


Why other options are incorrect:

  • A carbanion carries a negative charge and has a lone pair.


  • A carbene is neutral, has only two bonds, and possesses a lone pair.


  • An oxonium ion features a positively charged oxygen atom, not carbon.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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