What does the supplied NEET 2026 vitamin-matching question actually ask?
Option B is correct for the supplied vitamin question, not a bond-counting question. The record labelled “sigma and pi bonds neet 2026” contains a vitamin-source matching task. Its Chemistry / Chemical Bonding and Molecular Structure label conflicts with both the question and its Biology worked solution.
Editorial gate: Do not publish this solution under the requested sigma-and-pi-bonds title or keyword. Obtain the correct chemistry question, or retitle and recategorise this article around vitamin sources.
The supplied record identifies NEET 2026, 21 June, Code-50, with medium difficulty on this question bank’s scale. Assign the listed dietary sources to vitamins A, B12, E and K:
- List I: A = vitamin A; B = vitamin B12; C = vitamin E; D = vitamin K.
- List II: I = meat; II = sunflower oil; III = green leafy vegetables; IV = carrots.
Choose from these mappings:
How do you establish all four vitamin-source pairs?
Match each vitamin to its named source before checking the options. The supplied official solution follows the vitamin-source table it cites from NCERT Biology, Class 11, Chapter 16, Digestion and Absorption, Table 16.3. Use that source-by-source recall method rather than choosing an option after recognising one familiar food.
- Vitamin A: Carrots supply beta-carotene, which is a precursor of vitamin A. The transition is vitamin A → carrots → source IV → A-IV. Do not describe carrots as supplying preformed retinol: they supply the precursor.
- Vitamin B12: Animal foods such as meat supply this vitamin. The transition is vitamin B12 → meat → source I → B-I. Here, B is the List I identifier, not an answer-option choice.
- Vitamin E: Vegetable oils, including sunflower oil, are the listed source. The transition is vitamin E → sunflower oil → source II → C-II. Keep the vitamin’s name separate from its List I label, C.
- Vitamin K: Green leafy vegetables are the listed source. The transition is vitamin K → green leafy vegetables → source III → D-III.
These are the intended matches within this question, not claims that each vitamin occurs in only one food. Match the specific foods supplied rather than treating the list as a complete account of dietary sources.
How do you verify the complete mapping and choose option B?
The complete mapping is A-IV, B-I, C-II, D-III, in List I order. Every entry agrees with option B:
- A-IV: Vitamin A matches carrots.
- B-I: Vitamin B12 matches meat.
- C-II: Vitamin E matches sunflower oil.
- D-III: Vitamin K matches green leafy vegetables.
A-IV alone cannot decide the answer because options B and C both contain it. B-I separates them: List I label B means vitamin B12, whose intended source is meat.
Confirming C-II and D-III completes the check:
Final answer: option B. All four pairs agree, not just the first familiar match.
Why does option C fail even though two pairs are correct?
Option C swaps the intended sources of vitamin B12 and vitamin E. Its mapping is A-IV, B-II, C-I, D-III. It preserves vitamin A with carrots and vitamin K with green leafy vegetables, but makes two incorrect assignments:
- B-II: Assigns vitamin B12 to sunflower oil. The supplied solution matches B12 with meat.
- C-I: Assigns vitamin E to meat. The supplied solution matches E with sunflower oil.
Only two entries pass the check:
The faulty method is confirming two familiar plant-source pairs, then allocating the remaining foods without checking their specific vitamin relationships. Vitamin solubility does not make dietary sources interchangeable. A broad category such as “plant food” or “oil-soluble vitamin” cannot replace the specific source association being tested.
Can you apply the same method when the source labels change?
Use food names first and labels second. These are newly written practice questions from the vitamin-source material covered in the supplied solution’s Digestion and Absorption reference, not additional verified PYQs.
- A student assigns vitamin B12 to sunflower oil and vitamin E to meat. Which two assignments must be exchanged?
Answer: Vitamin B12 → meat, an animal-food source of this vitamin. Vitamin E → sunflower oil, the vegetable-oil source named in the supplied solution. Exchange the two assigned sources.
- A student says carrots provide preformed retinol. What correction is needed?
Answer: Carrots provide beta-carotene, a precursor from which vitamin A can be obtained. The correction concerns the form supplied by carrots, not whether carrots are an intended vitamin A source here.
- Sources are relabelled P = leafy greens, Q = carrots, R = sunflower oil and S = meat. Match vitamins A, B12, E and K.
Answer: Vitamin A-Q (carrots); vitamin B12-S (meat); vitamin E-R (sunflower oil); vitamin K-P (leafy greens).
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Frequently asked questions
Does the supplied NEET 2026 record contain a sigma and pi bond question?
No. Despite its sigma-and-pi-bonds label, the supplied record contains a vitamin-source matching question. It needs the correct chemistry question or a vitamin-source title and category before publication.
What is the correct vitamin-source matching in the supplied question?
The intended matches are vitamin A–carrots, vitamin B12–meat, vitamin E–sunflower oil and vitamin K–green leafy vegetables. These give A-IV, B-I, C-II, D-III, so option B is correct.
Why is option C wrong in the vitamin-source matching question?
Option C swaps the intended sources of vitamin B12 and vitamin E, assigning B12 to sunflower oil and E to meat. The correct pairs are B12–meat and E–sunflower oil. Its vitamin A and vitamin K matches are correct, but two correct pairs do not validate the complete option.
Do carrots contain retinol or beta-carotene?
Carrots supply beta-carotene, a precursor from which vitamin A can be obtained, rather than preformed retinol. This is why carrots are the intended vitamin A source in the supplied matching question.