Why benzaldehyde is less reactive than propanal (NCERT Example 8.3)बेंज़ैल्डिहाइड प्रोपेनैल से कम क्रियाशील क्यों (NCERT उदाहरण 8.3)Why benzaldehyde is less reactive than propanal (NCERT Example 8.3)

Class 12 Chemistry · Chapter 8 · interactive diagram

Parts and what they mean

• Benzaldehyde (normal structure) (बेंज़ैल्डिहाइड (सामान्य संरचना)) — Curved arrows: a ring π pair moves toward the C=O, and the C=O π pair moves onto O.
• Resonance structure: + at an ortho carbon (अनुनादी संरचना: ऑर्थो कार्बन पर +) — Negative charge on O, positive charge in the ring.
• Resonance structure: + at the para carbon (अनुनादी संरचना: पैरा कार्बन पर +) — The positive charge is spread over the ring, not concentrated on the carbonyl carbon.
• Resonance structure: + at the other ortho carbon (अनुनादी संरचना: दूसरे ऑर्थो कार्बन पर +) — Overall, the polarity of C=O is reduced, so the carbonyl carbon is less electrophilic.
• Resonance arrows (अनुनाद तीर) — All four are contributing structures of one real molecule.

Original diagram drawn by Simple Learning Hub, based on the NCERT textbook. Report a mistake