Chemistry Hydrocarbons MDCAT 2010
PMDC Verified Question 63 of 65
When hydrogen atom is removed from benzene, group left is called:
A
Alkyl group
B
Benzyl group
C
Methyl group
D
Phenyl group
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Phenyl group
Concept:

The removal of a hydrogen atom from an aromatic hydrocarbon ring generates an aryl group.

Formula:

$$ \text{C}_6\text{H}_6 \xrightarrow{-\text{H}} \text{C}_6\text{H}_5- $$

Solution:

  • Benzene has the molecular formula \( \text{C}_6\text{H}_6 \).


  • When one hydrogen atom is abstracted, the remaining fragment is \( \text{C}_6\text{H}_5- \).


  • This specific radical/group is formally named the phenyl group.


Why other options are incorrect:

  • An alkyl group is derived from an alkane by removing a hydrogen.


  • A benzyl group is \( \text{C}_6\text{H}_5\text{CH}_2- \), formed by removing a hydrogen from the methyl group of toluene.


  • A methyl group is \( \text{CH}_3- \), derived strictly from methane.

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.

Previous Question All Hydrocarbons MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App