Question

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	(IV) Functional Isomerism
(C) Propanone and propanal	(III) Position Isomerism
(D) Neopentane and Isopentane	(II) Chain Isomerism

• A. (A)–(II), (B)–(I), (C)–(IV), (D)–(III)
• B. (A)–(III), (B)–(I), (C)–(II), (D)–(IV)
• C. (A)–(I), (B)–(III), (C)–(IV), (D)–(II)
• D. (A)–(III), (B)–(I), (C)–(IV), (D)–(II)

Answer 1

The Correct Option is D

To identify correct pairings, we examine the isomeric relationships of compounds in List-I.
Step 1: Analyze (A) n-propanol and isopropanol.
n-propanol (\(\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}\)) and isopropanol (\(\text{CH}_3\text{CHOHCH}_3\)) differ in functional group position.
This is functional isomerism.
\[(A) \rightarrow \text{(IV)}.\]
Step 2: Analyze (B) Methoxypropane and ethoxyethane.
Methoxypropane (\(\text{CH}_3\text{OCH}_2\text{CH}_2\text{CH}_3\)) and ethoxyethane (\(\text{CH}_3\text{CH}_2\text{OCH}_2\text{CH}_3\)) differ in ether group arrangement.
This is metamerism.
\[(B) \rightarrow \text{(I)}.\]
Step 3: Analyze (C) Propanone and propanal.
Propanone (\(\text{CH}_3\text{COCH}_3\)) and propanal (\(\text{CH}_3\text{CH}_2\text{CHO}\)) have different functional groups (ketone vs. aldehyde).
This is functional isomerism.
\[(C) \rightarrow \text{(III)}.\]
Step 4: Analyze (D) Neopentane and isopentane.
Neopentane (\(\text{C}(\text{CH}_3)_4\)) and isopentane (\(\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}_2\text{CH}_3\)) differ in carbon chain arrangement.
This is chain isomerism.
\[(D) \rightarrow \text{(II)}.\]
Final Matches:
\[(A) \rightarrow \text{(IV)}, \, (B) \rightarrow \text{(I)}, \, (C) \rightarrow \text{(III)}, \, (D) \rightarrow \text{(II)}.\]
Correct Answer: (4).