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Haloalkanes and Haloarenes

Short Answer Type

191.

In the following pairs of halogen compounds which is faster undergoing S_N2 reaction?

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Long Answer Type

192.

Predict the order of reactivity of the following compounds in S_N1 and S_N2 reactions:
(a) The four isomeric bromobutanes.
(b) C₆H₅ H₂Br, C₆H₅CH (C₆H₅Br, C₆H₅CH (CH₃)Br, C₆H₅C(CH₃)(C₆H₅)Br.

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Short Answer Type

193.

Why (-NO₂) group shows its effect only at ortho- and para-position and not at meta–position?

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Long Answer Type

194. Although chlorine is an electron-withdrawing group, yet it is ortho, para-directing in electrophilic aromatic substitution reactions. Why?

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Short Answer Type

195. Identify chiral and achiral molecules in each of the following pair of compounds.

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196. Identify chiral and achiral molecules in each of the following pair of compounds.

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197. Identify chiral and achiral molecules in each of the following pair of compounds.

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198.
Explain the reason:

The reactivity order of alkyl bromides is tert alkyl bromide > sec alkyl bromide > primary alkyl bromide.

i) The given order is follow the S_N1 mechanism. In which carbon halogen bond is break and form carbocation and halogen ion.

ii) The carbocation is formed is then attacked by nucleophile in step to complete the substitution reaction.
According to S_N1 mechanism more is stability of carbocation easy is formation of compound. Hence the order of alkyl bromides are given as;

3⁰ > 2⁰ > 1⁰

Since tertiary cation is more stable than secondary and secondary is more stable than primary.

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