Write the balanced chemical equation for – Preparation of methane from iodomethane

Identify the term or substance based on the descriptions given below:

(i) Ice like crystals formed on cooling an organic acid sufficiently.

(ii) Hydrocarbon containing a triple bond used for welding purposes.

(iii) The property by virtue of which the compound has the same molecular formula but different structural formulae.

(iv) The compound formed where two alkyl groups are linked by $\overset{\underset{\text{||}}{\text{O}}}{\text{-C-}}$ group.

Fill in the blanks from the choices given in brackets – The compound formed when ethene reacts with hydrogen is …………… [CH₄, C₂H₆, C₃H₈]

Choose the correct answer from the options given – If the molecular formula of an organic compound is C₁₀H₁₈ it is –

(i) Alkene
(ii) Alkane
(iii) Alkyne
(iv) Not a hydrocarbon