Organic Chemistry - Some Basic Principles and Techniques Previous Year Questions — NEET Chemistry

2 past-year Organic Chemistry - Some Basic Principles and Techniques questions from NEET (Chemistry).

Q66 (2024)

The pair of molecules that are metamers among the following is:
  1. (1) $CH_3CH_2CH_2OH$ and $CH_3-CH(OH)-CH_3$
  2. (2) $CH_3OCH_2CH_2CH_3$ and $CH_3CH_2OCH_2CH_3$
  3. (3) {{OPT_IMG3}}
  4. (4) $CH_3CH_2CH_2CH_2CH_3$ and $(CH_3)_2CHCH_2CH_3$
### Related Formula $$\text{Metamers} \rightarrow \text{Different alkyl chains attached to polyvalent functional group}$$ ### Core Logic $CH_3-O-CH_2CH_2CH_3$ (methyl propyl ether) and $CH_3CH_2-O-CH_2CH_3$ (diethyl ether) have different alkyl groups attached on either side of the ether oxygen atom. ### Step 1: Conclusion Pair (2) represents metamers. ### Pattern Recognition Check polyvalent heteroatom ($O, S, NH$): unequal carbon distribution across functional group indicates metamerism. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Organic Chemistry - Some Basic Principles and Techniques

Q81 (2024)

The correct IUPAC name of the following compound is: $$CH_3-CH_2-CH(CH_2CH_3)-CH_2-CH(CH_3)-CH_2-CH_3$$
  1. (1) 2,4-diethylhexane
  2. (2) 3,5-diethylhexane
  3. (3) 3-ethyl-5-methylheptane
  4. (4) 3-methyl-5-ethylheptane
### Related Formula $$\text{IUPAC Rule: Longest chain select} \rightarrow \text{Lowest locant set} \rightarrow \text{Alphabetical substituent order}$$ ### Core Logic Longest continuous carbon chain contains 7 carbons (heptane). Numbering from left gives locants 3 (ethyl) and 5 (methyl). Alphabetical order: ethyl comes before methyl. ### Step 1: Conclusion IUPAC Name: 3-ethyl-5-methylheptane. ### Pattern Recognition Chain length is 7 (heptane), not 6 (hexane). Apply lowest locants + alphabetical prefix ordering. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Organic Chemistry - Some Basic Principles and Techniques
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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