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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.

A

(I), (II)

B

(I), (II), (III)

C

(III), (IV)

D

(IV)

Text Solution

Verified by Experts

The correct Answer is:
A
The boiling point order is alikynes gt alkenes gt straight-chain hydrocarbon gt branched-chain hydrocarbon gt cycloalkane (with the same number of C atom). So, the answer is (a). The melting point order is: alkynes gt trans-alkene gt cis-alkene gt cycloalkane gt branched-chain hydrocarbon gt straight-chain hydrocarbon.
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