Home
Class 12
CHEMISTRY
I : Tertiary amines do not form intermol...

I : Tertiary amines do not form intermolecular hydrogen bonds
II : All amines form H-bonds with water
III : Amines are higher boiling than alcohols and carboxylic acids of comparable molecularweights

A

I & II are wrong, III is right

B

I & III are right, II is wrong

C

I & II are right, III is wrong

D

II is right I, III are wrong

Text Solution

Verified by Experts

The correct Answer is:
C
I, III are wrong II is right
Promotional Banner

Topper's Solved these Questions

  • AMINES AND AZO COMPOUNDS

    AAKASH SERIES|Exercise PRACTICE SHEET - 3 (More than one correct answer questions)|6 Videos

  • AMINES AND AZO COMPOUNDS

    AAKASH SERIES|Exercise PRACTICE SHEET - 3 (Linked Comprehension type questions) Passage - I|3 Videos

  • AMINES AND AZO COMPOUNDS

    AAKASH SERIES|Exercise PRACTICE SHEET - 2 (Integer answer type Questions)|7 Videos

  • ALKYL AND ARYL HALIDES

    AAKASH SERIES|Exercise OBJECTIVE EXERCISE - 4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS)|19 Videos

  • AMINES AND DIAZONIUM SLATS

    AAKASH SERIES|Exercise PRACTICE EXERCISE|25 Videos

Similar Questions

Explore conceptually related problems

The amine that does not form hydrogen bonds is

In which of the following amines, intermolecular hydrogen bond does not exist

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

Explain the following: a) why the boiling points of primary amines are higher than those of the corresponding tertiary amines of similar molar mass. b) why aromatic amines are lesser basic than aliphatic amines ? c) why alcohols are more acidic than amines of comparable molar mass? d) Gabriel phthalimide synthesis is not useful in the preparation of aromatic primary amines?

(A) : Esters have lower boiling points than isomeric carboxylic acids . (R) : Carboxylic acids have strong inter molecular hydrogen bonding .

The carbon can form: i) All single bonds ii) One double and two single bonds iii) One single and one triple bond

(A): Ethanol is miscible in all proportions with water. (R): Hydrogen bonds are formed between water and alcohol molecules.

(A) Acetic acid in vapour state shows a molecular mass of 120. (R) It undergoes intermolecular hydrogen bond & forms a dimer.

Amines are less reactive in substitution reactions. Their reactivity is much lesser than alcohols and alkylflourides towards substitution. Protonation of the amino group makes it a better leaving group, but not nearly as good a leaving group as a protonated alcohol. Protonated amino groups cannot be displaced by OH^(-) because it would react immediately with the acidic hydrogen which would convert it in to a poor nucleophile. The leaving group in quartenary ammonium ion has about the same leaving tendency as a protonated amino group but does not have acidic hydrogen. The reaction of a quartenary ammonium ion with hydroxide ion is known as Hoffmann elimination reaction. The leaving group is tertiary amine. Since a tertiary amine is only a moderately good leaving group, the reaction requires heat. The carbon to which the tertiary amine is attached is designated as alpha carbon. When the hydroxide ion starts to remove a beta H from a quartenary ammonium ion, the leaving group does not immediately start to leave because a tertiary amine is not a good leaving group. As a result, a partial negative charge builds up on the carbon from which the proton is removed. Which of the following statements are true regarding Hoffmann elimination ?