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.



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