(i) Ducuss orbital structure of methane. (ii) Discuss orbital structure of ethylene. (iii) Discuss orbital structure of acetylene. (iv) Discuss the hybridization of carbon atom in allene (C_(3)H_(4)) and show the pi-orbital overlaps.

(i) Ducuss orbital structure of methane. (ii) Discuss orbital structu

1.	(i) Ducuss orbital structure of methane. (ii) Discuss orbital structure of ethylene. (iii) Discuss orbital structure of acetylene. (iv) Discuss the hybridization of carbon atom in allene (C_(3)H_(4)) and show the pi-orbital overlaps.
Answer» Answer :(iv) Allene are cummulative DIENES, `OVERSET(1)(C)H_(2)=overset(2)(C)=overset(3)(C)H_(2)` (Propa-1,2-diene). In allene `C_(1)` and `C_(3)` are `sp^(2)`-hybridized and `C_(2)` is sp-hybridized. The two `pi`-bonds are present in the central carbon, one each from `p_(y)`-and `p_(Z)`-orbitals thus, overlapping planes in `C_(1)` and `C_(3)` are ALSO different. `(##GRB_ORG_CHM_P1_C01_E01_011_A01##)`