JEE Advanced2009Chemistryp Block Elements (Group 13 & 14)Actual
In the reaction, 2 X + B ₂ H ₆ [ BH ₂( X )₂ ]⁺ [ BH ₄ ]⁻ The amine (s) X , is (are)
Options
- ANH ₃
- BCH ₃ NH ₂
- C( CH ₃ )₂ NH
- D( CH ₃ )₃ ~N
Correct answer
A. NH ₃
Step-by-step solution
Small amines such as NH ₃ CH ₃ NH ₂ and ( CH ₃ )₂ NH give unsymmetrical cleavage of diborane according to following reaction, aligned & B ₂ H ₆+2 NH ₃ & [ H ₂ ~B ( NH ₃ )₂ ]⁺ [ BH ₄ ]⁻ & aligned Large amines, such as ( CH ₃ )₃ ~N give symmetrical cleavage of diborane according to following reaction,