When `BF_3` is treated with LiH at 450 K, a hydride of borbon is formed. Briefly explain the structure of the above mentioned hydride.

When BF_3 is treated with LiH at 450 K, a hydride of borbon is formed. Identify the hydride of boron formed in the above reaction.

When BF_3 is treated with LiH at 450 K, a hydride of borbon is formed. Boron compounds behave as Lewis acids. Why?

Bromoethane when treated with alcoholic KOH gives ethene, KBr and H_2O . Explain the rule behind the above reaction .

Paragraph An organic compound A(C_(9)H_(6)O_(3)) does not react with aqueous solution of NaHCO_(3) as well as does not change the colour of litmus paper. Aon acid hydrolysis gives B(C_(9) H_(8)O_(4)) as major product whereas A on treatment with one equivalent of methanol in acidic medium gives C(C_(10)H_(10)O_(4)) as the major product (other minor isomer of C is also formed). B on heating with sodalime gives toluene. Answer the following questions based on the above information. The structure of A satisfying above conditions is

When 3-methylbutan-2-ol is treated with HBr,the, following reaction takes place: Give a mechanism for this reaction. (Hint: The secondary carbocation formed in step If, the arranges to a more stable- tertiary carbocation by a hydride ion shift from 3rd carbon atom.)

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.

Primary alkyl halide C_4 H_9 Br (a) reacted with alcoholic K O H to give compound (b). Compound (b) is reacted with HBr to give (c) which is an isomer of (a). When (a) is reacted with sodtum metal it gives compound (d), C_ 8 H_ 18 which, is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of (a) and write the equations for all the reactions.

Diborane is an important hydride of Boron a. During a class room discussion, a student argues that there is a covalent bond between boron atoms in diborane. What is your opinion. Give justification. b. Boron halides can act as Lewis acids. Give reason. c. Arrange the following Lewis acids in the increasing order of acidic strength. Substantiate your answer? 'BF_3 BCl_3, BBr_3'

When nitrobenzene is treated with Br_2 in the presence of FeBr_3 ,the major product formed is m-bromonitrobenzene. Statements which are related to obtain the m isomer are