i.Consider the hydrocarbons ethane, ethene and ethyne. The carbon atoms in these molecuies are in different hybridised states, What are these hybridisations?
ii. Give the complete structural formulae of these molecules and sketch diagrams to illustrate. the formation of a bonds in ethane and 'pi' bond in ethene.

Some hints regarding a hydrocarbon is given below. i) There are 5 carbon atoms in its main chain. ii) A double bond is there in between first and second carbon. iii) One methyl group is branched at the third carbon atom. a) Give the structural formula of the compound. b) To which family does it belong?

Two hints regarding a hydrocarbon is given below. * It consists of 4 carbon atom * The general formula of the series which indicates is C_(n)H_(2n+2) a) Write the molecular formula of the compound b) Give the structure of the compound. c) What will be the molecular formula of the hydrocarbon with the same number of carbon atoms and having a double bond d) Write the structure of the cyclic hydrocarbon with the same number of carbon atoms.

Controlled oxidation of alkanes in the presence of suitable catalysts give a variety of products. Free rotation about a carbon - carbon single bond is permitted in an alkane molecule. What are conformers? Draw the structure of the eclipsed and staggered conformers of ethane in Sawhorse and Newman projection and explain their relative stability.

State whether the following statements are true or false. a. In benzene, carbon uses all the three p obitals for hybridisation. b. Ácetylene is a tetrahedral molecule. c. Branched chain alkanes, alkenes and aromatic hydrocarbons have high octane numbers. d. Ethyne can be distinguished from ethene by using cold dilute KMnO_4^- e. In cracking, the larger molecule are broken down into smaller molecules and in reforming, cyclic and acyclic alkanes are converted into arenes.

Dimethyl glyoxime is added to alcoholic solution of NiCl2. When ammònium hydroxide is slowly added to it, a rosy red precipitate of a. complex appears. (i) give the structure of the complex showing hydrogen bonds (ii) give oxidation state and hybridisation of neutral metal ion (iii) Identify whether it is paramagnetic or diamagnetic