The substance which can accept electrons is a Lewis acid. 'BCl_3, BF_3' and 'BBr_3' are Lewis acids.
a. Arrange the above Lewis acids in the increasing,order of their acid strength.
b. Give reason for this order of acidic strength,
c. The chemistry of boron is different from that of other members of the same group. Mention any two differences and give reason.

Arrange the following compounds in the increasing order of their acidic strength. 3-nitro-phenol, phenol, 4-methyl phenol .

Arrange the following Lewis acids in the increasing order of acidic strength. Substantiate your answer. BF_3 , BCl_3 , BBr_3 .

Boron halides can act as Lewis acids. Give reason.

Arrange the following compounds in increasing order of their acidic strength .C_6H_5COOH , 4-nitrobenzoic acid, 3,4-dinitrobenzoic acid, 4-meth-oxybenzoic acid.

Arrange the following in decreasing order: HCOOH , CICH_2COOH , CH_3COOH (acidic strength).

Which of the following are lewis acids? 'H_2 O, B F_3, H^+ , N H4+

The acidic strength of oxoacids of chlorine is in the order 'HClO4,HClO3,HClO2,HClO' Briefly explain the reason for this.

Arrange CH_3 OH, H_2 O,C_6 H_5 OH in order of decreasing acid strength?

Paragraph Carboxylic acids are distinctly acidic because they ionize in water to give hydronium ions: RCOOH+H_(2)O hArr RCOO^(-) +H_(3)O^(+) The acidic strength depends upon the extent of ionizations of the acid and the stability of the anion formed. The acidic strength can also be expressed in terms of dissociation constant K_(a) or pK_(a) which are related as pK_(a)= -log K_(a) . Most unsubstituted carboxylic acids have K_(a) values in the range of 10^(-4) to 10^(-5) (pK_(a) =4-5) . The substitutents have marked effect on the acidic strength of carboxylic acids. Any group that stabilizes the carboxylate ion more than the carboxylic acid group will increase the acidic strength, and the group which destabilizes the carboxylate group more than the carboxylic acid group will decrease the acidic strength. In a similar manner, the electron-releasing groups makes benzoic acid weaker, while the electron-withdrawing groups make benzoic acid stronger. The ortho isomer of every substituted benzoic acid (whether electron releasing or electron withdrawing) is the strongest among the three isomers due to ortho effect. Which of the following is the weakest acid?