Assertion (A): Chlorobenzene is not formed in the reaction of phenol with thionyl chloride. Reason (R): In phenol, carbon-oxygen bond has partial double bond character.
Phenol's C-O bond is strengthened by resonance, making it resistant to nucleophilic substitution.
Phenol does not react with SOCl\(_2\) because the C-O bond in phenol has partial double bond character due to resonance. This prevents the replacement of -OH with -Cl, unlike in aliphatic alcohols. Since resonance explains the non-reactivity, (R) correctly explains (A).
The electron displacement effect observed in the given structures is known as:
Arrange the following halides in decreasing order of their reactivity towards dehydrohalogenation:
If \( \sqrt{5} - i\sqrt{15} = r(\cos\theta + i\sin\theta), -\pi < \theta < \pi, \) then
\[ r^2(\sec\theta + 3\csc^2\theta) = \]
The system of simultaneous linear equations :
\[ \begin{array}{rcl} x - 2y + 3z &=& 4 \\ 2x + 3y + z &=& 6 \\ 3x + y - 2z &=& 7 \end{array} \]
Calculate the determinant of the matrix: