Problem: Which of the following could act as a Lewis base?a. H2Ob. PCl3c. Lu3+d. FeCl3e. Both (a) and (b) are Lewis bases

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We’re being asked which of the given species is a Lewis base.

 Let’s first define a Lewis acid and a Lewis base.

Based on the Lewis definition:

Lewis acid is an electron pair acceptor.

Some characteristics of a Lewis acid:

When hydrogen is connected to an electronegative element such as P, O, N, S or halogens

▪ hydrogen gains a partially positive charge → makes hydrogen act as a Lewis acid

Positively charged metal ions

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Problem Details

Which of the following could act as a Lewis base?

a. H2O

b. PCl3

c. Lu3+

d. FeCl3

e. Both (a) and (b) are Lewis bases

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