Q.

Greater the Lewis base strength more stable will be the adduct formed with a Lewis acid. The most stable Lewis acid-base adduct among the following is

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a

H2O→BCl3

b

H2S→BCl3

c

H3N→BCl3

d

H3P→BCl3

answer is C.

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Detailed Solution

Greater the tendency to donate lone pair, more stable will be the Lewis acid-base adduct.Lewis basic strength order is(For the given options),→NH3>PH3>H2O>H2S As Lewis basic strength decreases,lone pair donation tendency decreases,therefore stability of Lewis acid-base adduct decreases.
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