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The hydrogen bond is an electrostatic at...

The hydrogen bond is an electrostatic attractive force between covalently bonded hydrogen atom of one molecule and an electronegative atom like (F,O,N) of other molecule. Hydrogen bond is nearly an electrostatic attractive force and not a normal chemical bond. It is very weak (2-10 kcal/mol) as compared to a colvent bond (strength 50-100 kcal/mol). In intramolecular hydrogen bonding, the two or more than two molecules of the same or different substances are linked to form polymeric aggregate. Intermolecular hydrogen bonding increases the boiling point of the compound and also its solubility in water. Intramolecular hydrogen bonding occurs within two atoms of the same molecule. Intramolecular hydrogen bonding is also called chelation, since it involves ring formation. intramolecular hydrogen bonding decreases the boiling point of the compound and also its solubility in water.
Which among the following has lowest boiling point?

A

B

`CH_(3)CH_(2)CH_(2)NH_(2)`

C

`CH_(3)CH_(2)-overset(CH_(3))overset(|)(NH)`

D

`CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(N)`

Text Solution

Verified by Experts

The correct Answer is:
D
Tertiary amines `(CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(N))` are not involved in intermolecular hydrogen bonding, hence their boiling point is lowest as compared to corresponding primary and secondary amines.
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Knowledge Check

  • The hydrogen bond is an electrostatic attractive force between covalently bonded hydrogen atom of one molecule and an electronegative atom like (F,O,N) of other molecule. Hydrogen bond is nearly an electrostatic attractive force and not a normal chemical bond. It is very weak (2-10 kcal/mol) as compared to a colvent bond (strength 50-100 kcal/mol). In intramolecular hydrogen bonding, the two or more than two molecules of the same or different substances are linked to form polymeric aggregate. Intermolecular hydrogen bonding increases the boiling point of the compound and also its solubility in water. Intramolecular hydrogen bonding occurs within two atoms of the same molecule. Intramolecular hydrogen bonding is also called chelation, since it involves ring formation. intramolecular hydrogen bonding decreases the boiling point of the compound and also its solubility in water. Which of the following compounds is (are) stabilised by intramolecular hydrogen bonding?

    A
    `Cl-overset(CI)overset(|)underset(CI)underset(|)(C)-overset(" "OH)overset(|)underset(" "OH)underset(|)(C)-H`
    B
    C
    `CH_(3)-overset(OH)overset(|)(C)=CH-overset(O)overset(||)(C)-OC_(2)H_(5)`
    D
    `{:(CH_(2)OH),(|),(CH_(2)OH):}`

  • The hydrogen bond is an electrostatic attractive force between covalently bonded hydrogen atom of one molecule and an electronegative atom like (F,O,N) of other molecule. Hydrogen bond is nearly an electrostatic attractive force and not a normal chemical bond. It is very weak (2-10 kcal/mol) as compared to a colvent bond (strength 50-100 kcal/mol). In intramolecular hydrogen bonding, the two or more than two molecules of the same or different substances are linked to form polymeric aggregate. Intermolecular hydrogen bonding increases the boiling point of the compound and also its solubility in water. Intramolecular hydrogen bonding occurs within two atoms of the same molecule. Intramolecular hydrogen bonding is also called chelation, since it involves ring formation. intramolecular hydrogen bonding decreases the boiling point of the compound and also its solubility in water. Which of the following molecules is dimerised when dissolved in non-polar or organic solvent?

    A
    `R-COOH`
    B
    `overset(COOH)underset(COOH)("| ")`
    C
    `R-OH`
    D

  • The hydrogen bond is an electrostatic attractive force between covalently bonded hydrogen atom of one molecule and an electronegative atom like (F,O,N) of other molecule. Hydrogen bond is nearly an electrostatic attractive force and not a normal chemical bond. It is very weak (2-10 kcal/mol) as compared to a colvent bond (strength 50-100 kcal/mol). In intramolecular hydrogen bonding, the two or more than two molecules of the same or different substances are linked to form polymeric aggregate. Intermolecular hydrogen bonding increases the boiling point of the compound and also its solubility in water. Intramolecular hydrogen bonding occurs within two atoms of the same molecule. Intramolecular hydrogen bonding is also called chelation, since it involves ring formation. intramolecular hydrogen bonding decreases the boiling point of the compound and also its solubility in water. Select the compound which involves intramolecular hydrogen bonding.

    A
    `HCOOH`
    B
    `CH_(3)COOH`
    C
    `C_(6)H_(5)COOH`
    D
    `CH_(3)COOH`