The most stable carbanion among the following is:

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OSSTET 2018 (Science CBZ) Official Paper (Held on 5 Oct 2018)
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  1. F5 Vinanti Teaching 20.02.23 D5
  2. F5 Vinanti Teaching 20.02.23 D6
  3. F5 Vinanti Teaching 20.02.23 D7
  4. F5 Vinanti Teaching 20.02.23 D8

Answer (Detailed Solution Below)

Option 4 : F5 Vinanti Teaching 20.02.23 D8
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Detailed Solution

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Concept:

  • The carbon atom bearing a negative charge is called a carbanion.
  • The stability of carbanion can be explained based on resonance, -I effect.

Explanation:

  • The stability of phenylmethanide F5 Vinanti Teaching 20.02.23 D9increases with -I groups if attached to the aromatic ring.
  • Among the given molecules, \(\rm -OCH_3, -CH_3\) groups are electron donating groups.
  • So they destabilise the given carbanion.
  • The compound F5 Vinanti Teaching 20.02.23 D10is stabilised by resonance.

Hence, it is more stable among the given compounds.

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