What is the molecular formula and structural formula of a cyclic hydrocarbon whose one molecule contains 8 hydrogen atoms ?

Q. Assertion :Molecular formula of water is $\left(H_{2}O\right)$. Reason: One molecule of water contains two atoms of hydrogen and one atom of oxygen.

Q. A hydrocarbon contains $10.5g$ C-per gram atom of hydrogen, 1 litre hydrocarbon at ${127}^{o}C$ and 1 atm pressure weight $2.8g$. Find out the empirical formula and the molecular formula.

Q. The molecules of the alkene family are represented by a general formula C_nH_2n. Answer the following:
(i) What do n and 2n signify?
(ii) What is the name of alkene when n = 4?
(iii) What is the molecular formula of the alkene, if there are six hydrogen atoms in it?
(iv) Write the molecular and structural formula of the first member of alkene family.
(v) Write the molecular formulae of lower and higher homologues of an alkene which contains four carbon atoms.

Q. A hydrocarbon contains 17.2% of hydrogen and has a relative molecular mass of 58. Its molecular formula is:
(Given: Atomic masses of: C = 12 g, H = 1 g)