In polymeric (BeCl(2))(n), there are:...

In polymeric `(BeCl_(2))_(n)`, there are:

Three centre four-electron bonds

Three centre three-electron bonds

two centre three-electron bonds

two centre two-electron bonds

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In cationic polymerizalion, the initiator is an electrophile that adds to the alkene, causing it to become a cation. The Initiator most often used in cationic polymerization is a lewis acid. Such as BF_(3) or AICI_(3) and in anionic polymerization, the iniliator is a nucleophile that reacts with the alkene to form a propagating site that is an anion. Arrange the following group of monomers of decreasing ability to undergo cationic polymerization

Out of SO_(2),BeCl_(2),O_(3),H_(2)O and HgCl_(2), the linear species are:

Give reasons for the following in one or two sentences only: BeCl_(2) can be easily hydrolysed'.

Identify the monomer in the following polymeric structure : [-CH_(2) - CH = CH - CH_(2) - CH_(2) - overset(CN)overset(|)(CH)-]_(n)

(a) [BeF_(4)]^(2-) exits, but [BeCl_(6)]^(4-) does not. Give reson. (b). Hydrated beryllium ion exists as [Be(H_(2)O)_(4)]^(2+) , whereas hydrated magnesium ion exists as [Mg(H_(2)O)_(6)]^(2+) . Give reason.

A linear polymeric biomolecule with reducing and non-reducing ends is

In the polymerase chain reaction, the optimum temperature for the polymerization step is

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The s-block hydride with covalent polymeric structure are

(a). What is the hybrid state of Be in BeCl_(2) in vapour state. What will be the change in the hybrid state of BeCl_(2) in the solid state? (b). Draw the structure of (i) BeCl_(2) (vapour state) and (ii) BeCl_(2) (solid state). (c ). Why do halides and hydrides of beryllium polymerise?

VK JAISWAL ENGLISH-s-BLOCK ELEMENTS-Level 2

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