Chemistry Industrial Chemistry PMDC Conceptual Practice
PMDC Verified Question 24 of 41
During an addition polymerization reaction, what occurs regarding the atomic composition of the reacting monomer units?
A
A fraction of the carbon skeleton is oxidized to carbon dioxide gas.
B
Hydrogen atoms are eliminated to produce conjugated polyene chains.
C
A small byproduct molecule such as water or alcohol is released.
D
All atoms of the original monomer are fully incorporated into the polymer backbone.
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: All atoms of the original monomer are fully incorporated into the polymer backbone.
Concept:

Addition polymerization proceeds with 100% atom economy; the molecular formula of the polymer repeating unit is identical to that of the monomer.

Formula / Reaction:

$$M_{\text{repeating unit}} = M_{\text{monomer}}$$

$$\text{Molecular Weight of Polymer } = n \times M_{\text{monomer}}$$

Solution:

  • The reaction involves rearrangement of \(\pi\)-bonding electrons into \(\sigma\)-bonds connecting adjacent monomers without the loss of any constituent atoms.


Why other options are incorrect:

  • Options A and B: No oxidation to \(\text{CO}_2\) or dehydrogenation occurs in standard addition polymerizations.


  • Option C: Elimination of small molecules characterizes condensation polymerization.

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 Industrial Chemistry 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