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1.is hybridisation the cause of particular shape of molecule? if not, what is cause for particular shape of molecule?explain. 2.how does hyperconjugation effect involve delocalisation of sigma bonds? 3.among PCl3,NH2- ,CH3+ and NF3 .determine order of reactivity of these towards water?

1.is hybridisation the cause of particular shape of molecule? if not, what is cause for particular shape of molecule?explain.


2.how does hyperconjugation effect involve delocalisation of sigma bonds?


3.among PCl3,NH2- ,CH3+ and NF3 .determine order of reactivity of these towards water?

Grade:12

1 Answers

Kamlesh Kumar
askIITians Faculty 60 Points
10 years ago
any compound having any type of hybridisation has a specific geometry e.g in CH4there is Sp3hybridisation having tetrahedral shape.if in any compound central atom has no lone pair then the shape of that molecule of a compound will be same as told in hybridisation but when central atom has any lone pair of e- thenshape of the molecule of that compound will be diffirent from as told in that particular hybridisation according to VSEPR theory due to repulsion between lp-lp>lp-bp>bp-bp. e.g NH3has Sp3hybridisation but shape is pyramidal due to repulsion between lp-bp bond angle decreases.

hyperconjugation is low order resonance & just like resonance hyperconjugation is also due to sigma(C--H) bond &pi bond or positive charge or odd electron conjugation.
e.g CH3---CH=CH2 four hyperconjugative structures are formed

no.of hyperconjugative structures= no.of alpha H + 1

in hyperconjugation H+remain at its position without bond with carbon atom.hence hyperconjugation is also named as NO BOND RESONANCE.


thanks &regards
kamlesh kumar
askiitians faculty

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