Long Answer TypeDiscuss the shape of the following molecules using VSEPR model:
BeCl2, BCl3, SiCl4, AsF5, H2S, PH3
Short Answer TypeWhat are the necessary conditions for hybridisation?
The necessary conditions for hybridization:
(i) The orbitals taking part in hybridization must have only a small difference of enthalpies.
(ii) The orbitals undergoing hybridisation generally belong to the valence of the atom.
(iii) It can take place between completely filled, half-filled or empty orbitals.
(iv) All the orbitals of the valence shell may or may not take part in hybridisation.
Long Answer TypeDiscuss in brief sp2 hybridization (hybridization in C = C bond). Discuss the molecular orbital structure of ethylene (first member of alkene).
Or
Draw diagrams showing the formation of a double bond between carbon atoms in C2H4.
Short Answer TypeApart from tetrahedral geometry, another possible geometry for CH4 is square planar with four H atoms at the corners of the square and the C atom at its centre. Explain why CH4 is not square planar?
Long Answer TypeShort Answer TypeThe central atoms in CH4, NH3 and H2O are all said to have similar hybridisation but the bond angle H – A – H (where A is C, N or O) is different in each case. Explain stating in which case it is maximum and in which case it is minimum.
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