Catalytic reforming overview: Select the correct statement about reforming with naphtha feed and its impact on gasoline quality, molecular weight, and yield.

Introduction / Context:
Catalytic reforming upgrades straight-run or hydrotreated naphtha to higher-octane reformate, also generating hydrogen for refinery hydrotreaters.

Given Data / Assumptions:

• Feed: naphtha-range hydrocarbons.
• Primary goal: raise octane for gasoline blending.
• Product slate: aromatics-rich reformate, plus hydrogen.

Concept / Approach:
Reforming reactions (dehydrogenation of naphthenes, isomerization of paraffins, limited hydrocracking) largely conserve carbon number distribution in the gasoline range, so average molecular weight changes modestly compared to deep cracking processes. Yield of gasoline-range components and quality (octane) both improve.

Step-by-Step Solution:

Verification / Alternative check:
Reformer mass balances show significant RON increase with hydrogen make, while product remains in gasoline boiling range.

Why Other Options Are Wrong:

• Each of (a), (b), and (c) is correct individually; the most complete and correct choice is the combined statement.

Common Pitfalls:
Confusing reforming with FCC/hydrocracking, which can strongly change molecular weight distribution.

Final Answer:
All of (a), (b) and (c).