Q42. Among the following the correct statement is
A. Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupy spherical 's' orbital and is less directional.
B. Bet

Question

Q42. Among the following the correct statement is
A. Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupy spherical 's' orbital and is less directional.
B. Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies sp³ orbital and is more directional.
C. Between NH3& PH3, PH3 is a better electron donor because the lone pair of electrons occupies sp³ orbital and is more directional.
D. Between NH3 & PH3, PH3 is a better electron donor because the lone pair of electrons occupies 's' orbital and is less directional.
Choose the most appropriate answer from the options given below:
(a) A only
(b) B only
(c) C only
(d) D only

FirstInTest · Accepted Answer

Correct answer: b. In NH3 lone pair on N is present in sp³ hybridized orbital and hence is more directional.Whereas in PH3 lone pair is present mainly in 3s orbital also the bond angle in PH3 is almost 90° and such compounds are regarded as drago compounds.So NH3 is more basic than PH3. This explanation directly supports statement B: NH3 is a better electron donor (more basic) because its lone pair occupies sp³ orbital and is more directional.

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