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Boiling Point of Carboxylic Acids

Consider the ...

Question

Consider the following Carbocations :
I) $C_{6} H_{5} \leftarrow C H_{2}$
II) $C_{6} H_{5} \leftarrow C H_{2} C H_{2}$
III) $C_{6} H_{5} \leftarrow C H \leftarrow C H_{3}$
IV) $C_{6} H_{5} \leftarrow C (C H_{3})_{2}$

I>II>III>IV

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II>I>III>IV

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IV>III>II>I

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IV>III>I>II

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Solution

The correct option is D IV>III>I>II
The stability of carbocation is increased in presence of phenyl ring (due to conjugation) and methyl groups (due to their electron-pushing tendency). More the methyl groups, more is the stability. Hence $I V$ will be most stable, followed by $I I I$ and then by $I$ . $I I$ will be least stable as the carbocation does not have resonance stabilization.
Therefore, the order of stability is
$I V > I I I > I > I I$

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Similar questions

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

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

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

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

C_{6} H_{5} + C H_{2}

C_{6} H_{5} C H_{2} + C H_{2}

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

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

S_{N} 1

C_{6} H_{5} - C | H C H_{3} - B r

C_{6} H_{5} - C H_{2} - B r

C_{6} H_{5} - C | H C H_{3} - I

C_{6} H_{5} - C H_{2} - I

C_{6} H_{5} + C H_{2}

C_{6} H_{5} C H_{2} + C H_{2}

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

C_{6} H_{5} C H_{2}^{+}

C_{6} H_{5} C H_{2} - C H_{2}^{+}

C_{6} H_{5} - C H^{+} - C H_{3}

C_{6} H_{5} C^{+} (C H_{3})_{2}

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