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kedar joshi Grade: 10
        

sir please explain me ,why boiling point of  branched chain alkanes is lesser then straight chain alkanes ? A boiling  point increases with increse in molecular mass?


2)WHY THE BOILING POINT OF PRIMARY ALCOHOLS IS GREATER THEN SECONDARY ALCOHOLS?


3)OH GROUP OF ETHYL ALCOHOLS IS NEUTRAL WHEREAS IT IS ACIDIC IN ACITIC ACID.WHY?


4)COOH GROUP OF AN ACID DOES NOT REACT WITH NaHSO3 even though it contains Cdouble bond O group?

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

1) this is because boiling point of alkanes depends on surface area of molecule...greater the surface area more will be the london forces ...


.so  in case of branched alkanes surface area is less because this molecule is like a sphere &  as we know area of a sphere is  lesser than any other shape ...


 unbranched alkanes are rod type structure so more surface area than sphere ,hence more boiling point...




2)alcohols can fom hydrogen bond among their own molecules so primary as well as secondary alcohols can form hydrogen bond  among their own molecules....due to this hydrogen bonding molecules associate and boiling point increases..but  the deciding factor among alcohols is the extent of hydrogen bonding...


unhindered alcohol will form more hydrogen bonds  than a hindered one, so primary alcohols have higher boiling point than secondary...

6 years ago
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