The order of strengths of the following carboxylic acids is
(i) \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{COOH}\)
(ii) \(\mathrm{CH}_3-\mathrm{COOH}\)
(iii) \(\mathrm{C}_6 \mathrm{H}_5-\mathrm{COOH}\)
(iv) \(\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2 \mathrm{COOH}\)

Consider the following sequence of reactions.
\(\mathrm{C}_6 \mathrm{H}_5 \mathrm{COONa} \xrightarrow[\Delta]{\mathrm{NaOH} / \mathrm{CaO}} \mathrm{X} \xrightarrow[\text { Anhy. } \mathrm{AlCl}{ }_3]{\mathrm{CO}+\mathrm{HCl}} \mathrm{Y} \xrightarrow[\mathrm{NaOH}]{\text { conc. }} \mathrm{A}+\mathrm{B}\).
If A is the reduction product of Y, what is B ?

The products formed, when gaseous \(\mathrm{HCl}\) is passed into aqueous \(\mathrm{Na}_2 \mathrm{SO}_3\) solution are

The wave functions of \(1 s\)-orbitals of two hydrogen atoms are \(\psi_A\) and \(\psi_B . \psi_A\) and \(\psi_B\) are linearly combined to form two molecular orbitals \(\left(\sigma\right.\) and \(\left.\sigma^*\right)\). Which of the following statements are correct?
I. \(\sigma^*\) is equal to \(\left(\psi_A-\psi_B\right)\).
II. In \(\sigma\)-orbital, one nodal plane is present in between two nuclei.
III. The energy of \(\sigma\)-orbital is lower than the energy of \(\sigma^*\)-orbital.

The number of products obtained in the following reaction is

Which of the following is not correct ?

Assertion (A) Fluorine has smaller negative electron gain enthalpy than chlorine.
Reason (R) The electron-electron repulsion is higher in chlorine than in fluorine.

Observe the following statements :
a. The thermal stability of hydrides of group 16 elements follow the order :
\(\mathrm{H}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{~S}>\mathrm{H}_2 \mathrm{Se}>\mathrm{H}_2 \mathrm{Te}\)
b. Acidic nature of hydrides of group 16 elements follow the order :
\(\mathrm{H}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{~S}>\mathrm{H}_2 \mathrm{Se}>\mathrm{H}_2 \mathrm{Te}\)
c. The reducing nature of \(\mathrm{H}_2 \mathrm{~S}, \mathrm{H}_2 \mathrm{Se}\) and \(\mathrm{H}_2\) Te follow the order :
\(\mathrm{H}_2 \mathrm{~S} < \mathrm{H}_2 \mathrm{Se} < \mathrm{H}_2 \mathrm{Te}\)
The correct statement are:

In a balanced meter bridge, the segment of wire opposite to a known resistance of \(70 \Omega\) is \(70 \mathrm{~cm}\). The unknown resistance is

If the normal to the curve \(y=x+\frac{2}{x}\) at the point where abscissa is 2 , meets the coordinate axes in points \(A \& B\), find the length of \(A B\).

Tangents are drawn at three points \(\mathrm{P}\left(\mathrm{t}_1\right), \mathrm{Q}\left(\mathrm{t}_2\right), \mathrm{R}\left(\mathrm{t}_3\right)\) on the parabola \(\mathrm{y}^2=\mathrm{x}\). Let these tangents intersect each other at the points \(\mathrm{L}, \mathrm{M}, \mathrm{N}\). If \(\mathrm{t}_1=2, \mathrm{t}_2=-4, \mathrm{t}_3=6\), then the area of the triangle LMN is

There are 10 points on the line \(A B\) excluding \(A\) and \(B\) and 8 points on \(A C\) excluding \(A\) and \(C\). Number of triangles formed with these points not considering \(A, B\) and \(C\) is

Arrange the following species in the decreasing order of their bond orders: