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Physical Properties of Alkenes

Out of cis-2 ...

Question

Out of cis-2 butene and trans-2-butene, which one has the lowest melting point ?

Cis-2-butene

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Trans-2- butene

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Both are equal

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Cannot be determined

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Solution

The correct option is A Cis-2-butene
Out of cis-2 butene and trans-2-butene, Cis-2-butene has the lower melting point as trans-2-butene has compact packing of the crystal lattice.

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2

2

\to

△ H_{1}

\to

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△ H = - 649.8 k c a l / m o l

9 △ H_{1} + 5 △ H_{2} = 0

△ H = - 647.0 k c a l / m o l .

△ H_{1}

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c i s - 2 - b u t e n e

t r a n s - 2 - b u t e n e

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