Q4 of 22 Page 1

Which would undergo SN1 reaction faster in the following pair:

?


Rate of SN1 reaction is directly proportional to the stability of carbocation formed after removal of halogen. We know that stability of carbocation is 3°>2°>1°> -CH3.



The carbocation formed from above pair will be


Since, 2° carbocation is more stable than 1°. Therefore, CH3− CH(Br)− CH3 would undergo SN1 reaction faster.


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What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 2/3 rd of tetrahedral voids?

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Write one similarity and one difference between the chemistry of lanthanoids and that of actinoids.

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(i) Write down the IUPAC name of the following complex: [Co(NH3)5Cl] 2+

(ii) Write the formula for the following complex: Potassium tetrachloridonickelate(II)


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Write the reagents required in the following reactions:

(i) CH2 = CH − CH2OH ¾ CH2 = CH − CHO


(ii) CH3− COOH ¾ CH3− CONH2


OR


Arrange the following compounds in increasing order of their property as indicated:


(i) CH3COCH3, C6H5COCH3, CH3CHO (reactivity towards nucleophilic addition reaction)


(ii) Cl − CH2− COOH, F − CH2− COOH, CH3 − COOH (acidic character)