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In the following pairs of halogen compounds, which compound undergoes faster SN1 reaction? - CBSE (Science) Class 12 - Chemistry

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Question

In the following pairs of halogen compounds, which compound undergoes faster SN1 reaction?

Solution 1

SN1 reaction proceeds via the formation of carbocation. The alkyl halide (I) is 3° while (II) is 2°. Therefore, (I) forms 3° carbocation while (II) forms 2° carbocation. Greater the stability of the carbocation, faster is the rate of SN1 reaction. Since 3° carbocation is more stable than 2° carbocation. (I), i.e. 2−chloro-2-methylpropane, undergoes faster SN1 reaction than (II) i.e., 3-chloropentane.

Solution 2

Reaction in `S_N1` is governed by stability of carbocations

 reacts faster due to greater stability of 3º carbocation.

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2018 to Current)
Chapter 10: Haloalkanes and Haloarenes
Q: 8.1 | Page no. 307

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Solution In the following pairs of halogen compounds, which compound undergoes faster SN1 reaction? Concept: Classification of Haloalkanes and Haloarenes.
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