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Can someone write me a clear understanding explanation to the following question? Thank you. Please state...

Can someone write me a clear understanding explanation to the following question? Thank you. Please state why you think you have the correct answer.

Example 1.13: Which of the following compounds undergoes a nucleophilic substitution reaction with ethyl chloride at the greatest rate.

A. H3CCHClNH2

B. ClH2CCH2NH2

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Answer #1

In Nucleophilic substitution, a Nucleophile attack on the carbon of ethyl chloride having Cl attached to it followed by removal of Cl.

In compound A, Cl is nearer to the NH2 group which attack on ethyl chloride as compared to that in compound B. Presence of Cl (a electron withdrawing group) makes the electron density on nitrogen less thus, Nucleophilicity of NH2 groups is less and it react at slow rate as compared to compound B.

Hence, answer is compound B.

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