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Basics of Organic Chemistry question

2024 · 5 Apr · Shift 2 · Q5
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  5. /2024 · 5 Apr · Shift 2 · Q5

Basics of Organic Chemistry question

2024 · 5 Apr · Shift 2 · Q5

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1

Match List - I with List - II.

LIST I
(Pair of Compounds)		 LIST II
(Isomerism)
A. n-propanol and Isopropanol I. Metamerism
B. Methoxypropane and ethoxyethane II. Chain Isomerism
C. Propanone and propanal III. Position Isomerism
D. Neopentane and Isopentane IV. Functional Isomerism

Choose the correct answer from the options given below :

  1. A
    (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
  2. B
    (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  3. C
    (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  4. D
    (A)-(I), (B)-(III), (C)-(IV), (D)-(II)
View written solutionFree

Correct answer: C

  1. Identify the type of isomerism for each pair

A. nnn-propanol and isopropanol

  • nnn-propanol: CH3−CH2−CH2OHCH_3-CH_2-CH_2OHCH3​−CH2​−CH2​OH
  • isopropanol: CH3−CHOH−CH3CH_3-CHOH-CH_3CH3​−CHOH−CH3​

Both have the same carbon skeleton of propane, but the −OH-OH−OH group is at different positions:

  • in nnn-propanol, −OH-OH−OH is on carbon 1
  • in isopropanol, −OH-OH−OH is on carbon 2

So, they show position isomerism.

Thus, A→IIIA \to IIIA→III

B. Methoxypropane and ethoxyethane

These are ethers:

  • methoxypropane: CH3−O−C3H7CH_3-O-C_3H_7CH3​−O−C3​H7​
  • ethoxyethane: C2H5−O−C2H5C_2H_5-O-C_2H_5C2​H5​−O−C2​H5​

They have the same functional group (ether), but different alkyl groups on the two sides of oxygen. This is metamerism.

Thus, B→IB \to IB→I

C. Propanone and propanal

  • propanone: ketone
  • propanal: aldehyde

They have the same molecular formula but different functional groups, so they are functional isomers.

Thus, C→IVC \to IVC→IV

D. Neopentane and isopentane

  • neopentane and isopentane differ in the arrangement of the carbon chain
  • same molecular formula, different carbon skeleton

So, they show chain isomerism.

Thus, D→IID \to IID→II

  1. Final matching
A→III,B→I,C→IV,D→IIA \to III, \quad B \to I, \quad C \to IV, \quad D \to IIA→III,B→I,C→IV,D→II
  1. Compare with options

This corresponds to Option C.

  1. Comparison with stored answer

Stored correct answer = C

Our derived answer = C

So, they agree.

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