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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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Knowledge Check

  • Which of the following statements is/are correct? i. Melting point of alkane increase with increase in number of C atoms and with increase in branching ii. Boiling point of alkaline increases with increase in number of C atoms but with decrease in branching iii. Cycloalkanes have lower boiling point than normal alkali with same number 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)

  • Boiling point of a liquid can be increased by

    A
    increasing the pressure
    B
    decreasing the pressure
    C
    purifying the liquid
    D
    adding water it

  • Which of the following explanation is correct? I.Boiling point of alkane increases with decrease in molecular weight of alkane II.Boiling point of alkane increases with increase in branching of alkane III.Boiling point of alkane decreases with increase in branching of alkane select the correct option

    A
    II and III
    B
    only III
    C
    I and II
    D
    All of the above

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    What effect the branching of an alkane has on its boiling point?

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    The boiling points of halogens increase with increase in molecular weight, it is because

    As the number of carbon atoms in a chain increases the boiling point of alkanes

    The increasing order of the boiling point of alcohol is

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