Home
Class 12
CHEMISTRY
Statement-I: Boiling point of alkyl hali...

Statement-I: Boiling point of alkyl halide increases with increases in molecular weight.
Because Statement-II: Boiling point of alkyhalides are in the order `RI gt RBr gt RCI gt RF`.

A

Statement-I is True, Statement-II is True, Statement-II is a correct explanation for Statement-I

B

Statement-I is True, Statement-II is True, Statement-II is NOT a correct explanation for Statement-I

C

Statement-I is True, Statement-II is False.

D

Statement-I is False, Statement-II is True.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements, let's break down the reasoning step by step. ### Step 1: Evaluate Statement-I **Statement-I**: Boiling point of alkyl halide increases with increases in molecular weight. - **Explanation**: This statement is true. The boiling point of a compound is influenced by its molecular weight. Generally, as the molecular weight of alkyl halides increases, the van der Waals forces (dispersion forces) between the molecules also increase, leading to a higher boiling point. Therefore, larger alkyl halides tend to have higher boiling points. ### Step 2: Evaluate Statement-II **Statement-II**: Boiling points of alkyl halides are in the order RI > RBr > RCl > RF. - **Explanation**: This statement is also true. The boiling points of alkyl halides can be compared based on the halogen's atomic size and molecular weight. Iodine (I) has the highest molecular weight and size, followed by bromine (Br), chlorine (Cl), and fluorine (F). Hence, the order of boiling points is indeed RI > RBr > RCl > RF, with RI having the highest boiling point and RF having the lowest. ### Step 3: Determine the Relationship Between the Statements - While both statements are true, Statement-II does not serve as a correct explanation for Statement-I. Statement-I discusses the general trend of boiling points with molecular weight, while Statement-II provides a specific order based on the halogens involved. The increase in boiling point with molecular weight is a broader principle that applies to all alkyl halides, not just the specific order given in Statement-II. ### Conclusion - **Final Answer**: Both Statement-I and Statement-II are true, but Statement-II is not the correct explanation of Statement-I.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ALKYL AND ARYL HALIDE

    ALLEN|Exercise EXERCISE-02|1 Videos

  • ALKYL AND ARYL HALIDE

    ALLEN|Exercise EXERCISE-04 [A]|1 Videos

  • ALKYL AND ARYL HALIDE

    ALLEN|Exercise EXERCISE-01|1 Videos

  • ALKENE, ALKANE & ALKYNE

    ALLEN|Exercise EXCERSISE-3|28 Videos

  • Atomic Structure

    ALLEN|Exercise All Questions|62 Videos

Similar Questions

Explore conceptually related problems

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

The correct order of boiling points of alkyl halides is

Knowledge Check

  • The boiling point of acetic acid is higher than expected from its molecular weight because of

    A
    Association through hydrogen bonding
    B
    Strong ionizing power
    C
    Non-polar character
    D
    Solubility in water.

  • The boiling point of acetic acid is higher than expected from its molecular weight because of

    A
    Association through hydrogen bonding
    B
    Strong ionizing power
    C
    Non-polar character
    D
    Solubility in water.

  • The boiling point of acetic acid is higher than expected from its molecular weight because of

    A
    Association through hydrogen bonding
    B
    Strong ionizing power
    C
    Non-polar character
    D
    Solubility in water.

    • Similar Questions

    Explore conceptually related problems

    Statement-I : Solubility on n-alcohols in water decreases with increase in molecular weight Because Statement-II: The relative proportion of the hydrocarbon part in alcohols increases with increasing molecular weight which permits enhanced hydrogen bond with water.

    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.

    Assertion( A) The boiling points of alkyl halides decrease in the order RI gt RBr gt RCl gt RF Reason (R) The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

    Statement-I: Chloropropane has higher boiling point than chloroethane. Because Statement-II: Haloalkanes are polar molecules.

    In general boiling point of covalent compounds is affect due to increasing molecular weight and hydrogen bonding. Thus it is obversed that the boiling point of octanol is greater that water while that of methanol is lesser than water. The other properties which are considerably affected due to hydrogen bond formation are acidic nature, melting point, anamalous behaviour of water below 4^(@)C ., It is therefore concluded that hydrogen bonding palys a vutal role in explaning many observable facts. Q. Which among the following has maximum boiling point?

    Home
    Profile