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
▪ can accept negative electron pairs → can act as Lewis Acids
• Central element that has less than 8 valence electrons around it
▪ more likely to accept an electron pair to follow the octet rule
▪ can accept electron pair → can act as Lewis acid
Lewis base is an electron pair donor.
Some characteristics of a Lewis base:
• Compounds that have lone pair(s) on a central element can act as Lewis bases.
• Compounds that possess a negative charge can act as Lewis Bases.
4 CO + Ni ⇌ Ni(CO)4
Identify the Lewis acid and Lewis base in the reaction:
(c) 4 CO + Ni ⇌ Ni(CO)4
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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.