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Dehydration of Alcohols

164

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164% Most stable carbocation is4(a) CH3- CH2(b) CH3-CH CH3(c) C(CH3)3(d) C6H5-CH2 (BHU)

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Q. What is the correct order of the following carbocations from most stable to least stable?
I)

C H_{3} - \oplus C H - C H_{3}

C H_{3} - \oplus C H - O C H_{3}

C H_{3} - \oplus C H - C H_{2} - O C H_{3}

.

C H_{2} = C H - ⨁ C H_{2}

C_{6} H_{5} - ⨁ C H_{2}

C H_{3} - ⨁ C H - C H_{3}

Decreasing order of stability of the given above carbocations is:

Q. In which of the following pairs of carbocations, the first carbocation is more stable than the second?

C H_{2} = C H - + C H_{2} and C H_{2} = C H - C H_{2} - + C H_{2}

C H_{3} - N H - + C H_{2} and + C H_{2} - O H

C H_{3} - O - C H_{2} - + C H_{2} and C H_{2} - O - + C H_{2}

C H_{3} - + C H - C H_{2} C H_{2} C H_{3} and C H_{3} C H_{2} - + C H - C H_{2} C H_{3}

Q. Consider the following Carbocations :
I)

C_{6} H_{5} \leftarrow C H_{2}

C_{6} H_{5} \leftarrow C H_{2} C H_{2}

C_{6} H_{5} \leftarrow C H \leftarrow C H_{3}

C_{6} H_{5} \leftarrow C (C H_{3})_{2}

Q. Which pair of the following carbonyl compounds can be differentiated by

I_{2} / N a O H

?

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