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Q.

Which of the statements 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 number of C atoms.IV. Alkenes have lower boiling point than same number of C atoms in alkanes.

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a

(I), (II)

b

(I), (II), (III)

c

(III), (IV)

d

(IV)

answer is A.

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Detailed Solution

The boiling point order is alkynes ) alkenes > straight-chain hydrocarbon > branched-chain hydrocarbon > cycloalkane (with the same number of C atom).So, the answer is (l).The melting point order is: alkynes > trans-alkene > cis-alkene > cycloalkane > branched-chain hydrocarbon > straight-chain hydrocarbon.
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Which of the statements 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 number of C atoms.IV. Alkenes have lower boiling point than same number of C atoms in alkanes.