The heat of formation of \(\mathrm{H}_{2} \mathrm{O}(l)\) is \(-286 \mathrm{~kJ}\).
The heat of formation of \(\mathrm{H}_{2} \mathrm{O}(\mathrm{g})\) is likely to be

Given that the freezing point of benzene is \(5.48^{\circ} \mathrm{C}\) and its \(\mathrm{K}_{\mathrm{f}}\) value is \(5.12{ }^{\circ} \mathrm{C} / \mathrm{m}\). What would be the freezing point of a solution of \(20 \mathrm{~g}\) of propane in \(400 \mathrm{~g}\) of benzene?

Match the reaction in Column I with the major product formed given in Column II.
\(\begin{array}{|l|l|l|} \hline & \text { Column I- Reaction/conditions } & & \text { Column II- Product } \\ \hline A & \mathrm{C}_6 \mathrm{H}_6 \xrightarrow[\substack{\text{(ii) NaOH} \\ \text{(iii) H^+}}]{\text{(i) Oleum}} & P & \text { Pentan-2-ol. } \\ \hline B & \text{Butanal } \xrightarrow[\text{(ii) } \mathrm{H}^+]{\text{(i) } \text{MeMgBr/ dry ether}} & Q & \text { 2-Hydroxybenzoic acid. } \\ \hline C & \text {2-Methylpropene } \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}_2 / \mathrm{NaOH}]{\text { (i) } \mathrm{B}_2 \mathrm{H}_6} & R & \text { Phenol } \\ \hline D & \text{Phenol } \xrightarrow[\text { (ii) } \mathrm{CO}_2, 400 \mathrm{~K}, 7 \mathrm{~atm} .]{\text { (i) } \mathrm{NaOH}} & S & \text { 2-Methylpropan-1-0 I } \\ \hline \end{array}\)

Identify the product formed when the following reaction occurs.


?

Given below are 4 species with one odd electron on the Carbon atom.
\(\begin{array}{ll}
\mathrm{A}=\left(\mathrm{CH}_3\right)_3 \stackrel{\bullet}{\mathrm{C}} & \mathrm{B}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_3 \stackrel{\bullet}{\mathrm{C}} \\
\mathrm{C}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H} & \mathrm{D}=\left(\mathrm{CH}_3\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H}
\end{array}
\)



Choose the correct decreasing order of stability of the species.

A given mass of a hydrocarbon on complete combustion produced \(176 \mathrm{~g}\) of \(\mathrm{CO}_2\) and \(90 \mathrm{~g}\) of \(\mathrm{H}_2 \mathrm{O}\). What is the Molecular formula of the compound?

The chloro compound having the lowest dipole moment is:

Which of the following artificial sweeteners can be used in soft drinks only?

The length of the latus rectum of the curve represented by \(x = 3(\cos t + \sin t)\) and \(y = 4(\cos t - \sin t)\) is:

A crane with a steel cable of length \(11 \mathrm{~m}\) and radius \(2.0 \mathrm{~cm}\) is employed to lift a block of concrete of mass 40 tons in a building site. If the Young's modulus of steel is \(2.0 \times 10^{11} \mathrm{~Pa}\), what will be roughly the increase in the length of the cable while lifting the block?
(Take, \(g=10 \mathrm{~ms}^{-2}\) )

A transition elements with atomic number 24 will have its magnetic moment

In which of the following complex ion, the central metal ion is in a state of \(s p^{3} d^{2}\) hybridisation?

If the coefficients of \(x^2\) and \(x^3\) in the expansion of \((3 + kx)^9\) are equal, then the value of '\(k\)' is