Consider the following statements regarding NMR spectroscopy. Determine whether each each statement is true or false. 1. The TMS protons are highly shielded and appear downfield of other organic protons in an NMR spectrum.
2. NMR spectroscopy requires a nucleus having non-zero electron spin.
3. A typical value for the chemical shift of methyl protons is 1.2.
4. Spin-spin splitting arises from interactions of one proton with a neighboring nucleus.

10 years is the answer

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este