Question

According to basic strength, arrange them in increasing order.
$F^{-},{EtO}^{-},{{Me}_{2}N}^{-},{{CH}_3{CH}_2}^{-}$

• A. ${EtO}^{-}<F^{-}<{{Me}_{2}N}^{-}<{{CH}_3{CH}_2}^{-}$
  
• B. $F^{-}<{EtO}^{-}<{{Me}_{2}N}^{-}<{{CH}_3{CH}_2}^{-}$
• C. $F^{-}<{EtO}^{-}<{{CH}_3{CH}_2}^{-}<{{Me}_{2}N}^{-}$
  
• D. ${{CH}_3{CH}_2}^{-}<F^{-}<{EtO}^{-}<{{Me}_{2}N}^{-}$
  

Answer 1

Answer: (B)

$F^{-}<{EtO}^{-}<{{Me}_{2}N}^{-}<{{CH}_3{CH}_2}^{-}$

$F^{-},Et{O}^{-},M{e}_2{N}^{-},C{H}_{3}C{H}_2^{-}$

If the atoms donating electrons have identical outer shell then nucleophilic will be directly proportional to the base strength.

So, here the base strength $\propto \frac{1}{Electronegativityofatom}$

$C{H}_{3}C{H}_2^{-}>M{e}_2{N}^{-}>Et{O}^{-}>F^{-}$ in the order