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CBSE Class 12 Chemistry Haloalkane Haloarenes Exam Notes. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.
Ans. (a) & (c) With four different alkyl group.
Q4.Although chlorine is an EWG yet it is ortho-para directing in electro plilic aromatic substitution Rx.
Ans.Chlorine shows –– I effect causing the intermediate carbocation will destabilize but +R effect of Cl stabilizes the intermediate carbocation. The reactivity is controlled by the stronger – I effect while orientation is controlled by weaker reasoned effect.
Q5.Haloalkanes react with KCN to form RCN but with AgCN form RNC?
Ans.CN is an ambidient group (can be attached from both the ends). In KCN, it is ionic bond, the reaction occuss through C since C – C bonds are more stronger while in AgCN (covelent bonding), only N electron pair is available for bond formation.
Q6.RCl is hydrolysed to ROH slowly but the reaction is rapid if a catalytic amount of KI is added to the reaction mixture.
Ans.I– is stronger nucleoplile so it replace Cl to form RI then RI is more hydrolysed to yield ROH due to I–ion is a better leaving group than Cl–.
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