The number of hydrogen atoms that are present in the molecular formula of methane is ______.

Q.

The molecular formula of diphenyl methane,

How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom

Q. The molecular formula of diphenyl methane is $C_{13}{H}_{12}.$ How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom?

Q. Assertion :Molecular formula shows the exact number of different types of atoms present in a molecule of a compound. Reason: Molecular formula can be obtained directly from empirical formula which represents the simplest whole number ratio of various atoms present in a compound.

Q. The reaction in which a chlorine atom replaces a hydrogen atom in a molecule of methane is called ______________.

Q. Write the:
(a) molecular formula of methane and ethane