Q.

Among the halides1.  BCl3     2. AlCl3     3. GaCl3     4. InCl3The order of decreasing Lewis acid character is:

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a

1,2,3,4

b

4,3,2,1

c

3,4,2,1

d

2,3,4,1

answer is B.

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Detailed Solution

Among the halides.1. BCl3​, 2. AlCl3​, 3. GaCl3​, 4. InCl3​The order of decreasing Lewis acid character is 1. BCl3​, 2. AlCl3​, 3. GaCl3​, 4. InCl3​.  On moving down the boron family, the Lewis acid character decreases.
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