Chemical Bonding And Molecular Structure Question 485
Question: Which of following statement is true-
Options:
A) Absolutely pure water does not contain any ions
B) London forces is directly proportional to more number of loosely held electron
C) Allene is polar due to its non-planar structure
D) $ CH_3OCH_3 $ is less volatile than $ C_2H_5OH $ due to higher molecular weight.
Show Answer
Answer:
Correct Answer: B
Solution:
(1) $ H_2O\rightarrow {H^{+}}+O{H^{-}} $ $ K_{w}={10^{-14}} $ at $ 25^{o} $ Even in conductivity water $ (H_2O) $ is found to be dissociated into $ {H^{+}} $ and $ O{H^{-}} $ . (2) More the number of loosely held electron, greater will be their tendency for being polarized deformed i.e., the magnitude of formal charge increases, hence London forces increases. (3) $ H_2C=C=CH_2 $ (Non planar) $ {\mu_{D}}=0 $ (4) In $ CH_3COCH_3 $ there is no H-bonding hence more volatile, while in $ C_2H_5OH $ intermolecular H-bonding is present hence less volatile, due to association.
