NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice
Methane is quite stable, whereas silane is unstable? Because -
Options
- AC — C bond energy is much greater than S i — S i bond energy
- BS i — H bond energy is much lower than C — H bond energy
- CS i has vacant p- orbitals which are more susceptible for nucleophilic attack
- DAll of above reasons
Correct answer
B. S i — H bond energy is much lower than C — H bond energy
Step-by-step solution
S i — H bond energy is 393 k J / m o l Whereas, C — H bond energy is 435 k J / m o l D C — C ⋍ 340 k J / m o l & D S i — S i ⋍ 368 k J / m o l C — C and S i — S i bond energies are comparable, while Si − H bond energy is lower than C − H bond energy, so methane is quite stable, whereas silane is unstable.