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Physical Properties of Alkenes

A straight-ch...

Question

A straight-chain alkene has a lower melting point than a branched-chain alkane with the same number of carbon.
State whether the statement is true or false

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Solution

A straight chain alkene has lower melting point than a branched chain alkane with same number of carbon. This is due to compact packing of the crystal lattice.

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Q. A straight chain alkane has a boiling point greater than a branched chain alkane. True of false?

Q. Assertion :A straight chain alkene has higher boiling point than a branched chain alkane with same number of carbons. Reason: Branching decreases the surface area, hence,van der Waal's force of attraction

Q. Assertion :Hexane has higher melting points than both pentane and heptane. Reason: melting point of a straight chain alkane with odd number of carbon is always less than adjancent homologues with even number of carbons.

Q. Fill in the blanks : [5 MARKS]
(i) Members of the alkene series containing ....... to ....... number of carbon atoms are liquids.
(ii) Among isomers, the one with more branched chain has a ...... boiling point.
(iii) The term ....... is used when one carbon atom is attached to four other carbon atoms.
(iv) The molecular mass of any two homologues differs by ....... amu.
(v) The melting point of alkanes increases with ....... in molecular weight.

Q. Assertion :Pentane and 3-methylpentane are chain isomers. Reason: Pentane is a straight-chain alkane while 3-methyl pentane is a branched-chain alkane

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