Question

Which from following compounds does NOT contain double bond in it ?

• A. Tetrahydrofuran
• B. 4 H - Pyran
• C. Pyrrole
• D. Thiophene

Hint:

Tetrahydrofuran is the fully saturated form of furan, so it has no C=C bond.

Answer 1

The Correct Option is A

Step 1: Think of the name:
The prefix "tetrahydro" means four extra hydrogens have been added to furan, which saturates both of its C=C bonds. So tetrahydrofuran has none left.

Step 2: Check the rest:
4H-Pyran: the "4H" means position 4 is $\text{sp}^3$ ($\text{CH}_2$), but the other four ring carbons are joined by two double bonds.
Pyrrole: a five-membered ring with two C=C bonds and the N lone pair in the aromatic sextet.
Thiophene: the same pattern with sulfur, two C=C bonds in the ring.

Step 3: Answer:
Only THF lacks a C=C bond, so it is the compound asked for.

Final Answer:
Option (A), tetrahydrofuran. \[ \boxed{\text{Tetrahydrofuran (A)}} \]