Which of the following statements is false?a)Dimethyl amine as well a...
Hydrogen bonding is the wrong intermolecular attraction between an electrophilic O–H or N–H hydrogen atom and a pair of non-bonding electrons. Thus a hydrogen bond requires both a hydrogen bond donor (a molecule having O–H or N–H group) and a hydrogen bond acceptor (a molecule having lone pair of electrons). Thus dimethyl amine can serve as hydrogen bond donor due to N–H group as well as hydrogen bond acceptor due to lone pair of electrons on N. Such molecules can form hydrogen bond with themselves and also with water (or other hydrogen bond donor). On the other hand, trimethylamine can serve only as a hydrogen bond acceptor since it has a lone pair of electrons but not hydrogen on N. Hence it can form hydrogen bonds with water but not with themselves.
Which of the following statements is false?a)Dimethyl amine as well a...
False Statement: Trimethylamine forms a hydrogen bond neither with itself nor with water.
Explanation:
Hydrogen Bond: A hydrogen bond is a type of chemical bond that occurs when a hydrogen atom is bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) and is attracted to another electronegative atom in a different molecule.
Statement a: Dimethyl amine as well as trimethyl amine are soluble in water.
Explanation: This statement is true. Both dimethyl amine (CH3-NH-CH3) and trimethyl amine (CH3-N(CH3)2) are soluble in water. This is because they can form hydrogen bonds with water molecules, which allows them to mix with and dissolve in water.
Statement b: Trimethylamine forms a hydrogen bond neither with itself nor with water.
Explanation: This statement is false. Trimethylamine (CH3-N(CH3)2) can form hydrogen bonds with both itself and water. In trimethylamine, the nitrogen atom has a lone pair of electrons which can act as a hydrogen bond acceptor. It can form hydrogen bonds with other trimethylamine molecules and with water molecules.
Statement c: Trimethyl amine can act as a hydrogen bond acceptor only, while dimethyl amine can serve as both a hydrogen bond donor and acceptor.
Explanation: This statement is true. In trimethylamine, the nitrogen atom can only act as a hydrogen bond acceptor. It can accept hydrogen bonds from hydrogen bond donors such as water molecules. On the other hand, in dimethyl amine, the nitrogen atom can act as both a hydrogen bond donor and acceptor. It can donate a hydrogen bond from the hydrogen attached to it and accept hydrogen bonds from other hydrogen bond donors.
Therefore, the false statement is option 'B': Trimethylamine forms a hydrogen bond neither with itself nor with water.
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