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Which of the statement is correct ? I....

Which of the statement is correct ?
I. Melting point of alkane increases with increase of C atoms and with increase in branching.
II. Boiling point of alkane increases with increase of C atoms but with decrease in branching.
III. Cycloalkanes have lower boiling point than normal alkane with same numer of C atoms.
IV. Alkenes have lower boiling point than same number of C atoms in alkanes.

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PRADEEP-HYDROCARBONS-ADDITIONAL QUESTIONS (SHORT ANSWER QUESTIONS)
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  12. How can alkenes be prepared from (i) alcohol, and (ii) an alkyl halide...

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  13. How is bromoethane prepared from (i) ethanol (ii) ethane?

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