is this correct Which of these molecules can hydrogen bond with another of the same molecule?1. CH3CONH22. (CH3)3N3. HBr4. CH3OH1,3,41,2, 3,41 only4 only1,2,4O 3 only1 and 4 only2 onlyO 1 and 2 only

An acidic substance furnishes the hydrogen ions into the aqueous solutions and hence its lowers the pH of the medium. Example: HBr. The compounds that have a notable dipole moment between the bonds especially O-H bonds are termed as polar protic. The amide functional group is represented as -CONH2, when it is connected to a methyl group, then the resultant molecule is termed as the acetamide. According to the Lewis base concept, when a molecule can furnish its unshared electron pair to other species such as electrophiles, then it is termed as the Lewis base.When hydrogen that is already formed a single covalent bond with a high electronegative atom is involved in the electrostatic attraction with the lone pair of another high electronegative atom, then the interaction is termed as hydrogen bonding. In amide, the hydrogen of N-H bond can form hydrogen bonding with the lone pair of nitrogen on another molecule of amide. In trimethylamine, there is no hydrogen atom that is directly bonded to the high electronegative atom like O, F, and N. so the absence of N-H bond in triethylamine fails from forming hydrogen bonding. In H-Br, the hydrogen is bonded to the less electronegative atom such as bromine. Moreover, the larger size of bromine and the high energy levels of the orbitals that have the lone pairs makes them fail to form hydrogen bonding with each other. In methanol, the hydrogen is bonded directly to the electronegative oxygen. Notably, the hydrogen can also have the dipole-interactions with the lone pair of another methanol molecule. So hydrogen bonding is feasible. Hence the seventh option (1 and 4 only) is correct. The First option is incorrect since it has option 3 in it. The second option is incorrect since all four molecules will not form hydrogen bonding with each other. The third option is incorrect. Besides amide methanol can also involve in hydrogen bonding. The fourth option is incorrect since along with methanol, acetamide can also form hydrogen bonding. The fifth option is incorrect since trimethylamine will not form hydrogen bonding. The sixth option is incorrect since HBr cannot form self hydrogen bonding. The eighth option is incorrect since trimethylamine shows reluctance in forming hydrogen bonding with each other. The ninth option is incorrect since the option has 2 in it. Hence the direct bonding of hydrogen with the high electronegative atom facilitates the formation of hydrogen bonding in CH3CONH2 and CH3OH among themselves.