The number of s-electrons present in an ion with \(55\) protons in its unipositive state is

The major product (\(Y\)) in the following reactions is \(\begin{array}{*{20}{c}}
  {C{H_3}\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - CH - C = CH} 
\end{array}\xrightarrow[{{H_2}O}]{{HgS{O_4},{H_2}S{O_4}}}X\) \(\xrightarrow[{(ii)\,conc.{H_2}S{O_4}/\Delta }]{{(i)\,{C_2}{H_5}MgBr,{H_2}O}}Y\)

\(150\,g\) of acetic acid was contaminated with \(10.2\,g\) ascorbic acid \(\left( C _{6} H _{8} O _{6}\right)\) to lower down its freezing point by \(\left( x \times 10^{-1}\right)^{\circ} C\). The value of \(x\) is (Nearest integer) [Given \(K _{ f }=3.9\,K\,kg\,mol ^{-1}\);Molar mass of ascorbic acid \(=176\,g\,mol ^{-1}\) ]

Match List - I with List - II.

List - I Vitamin	List - II Name
A. Vitamin \(B_1\)	I. Pyridoxine
B. Vitamin \(B_2\)	II. Ascorbic acid
C. Vitamin \(B_6\)	III. Thiamine
D. Vitamin C	IV. Riboflavin

Choose the correct answer from the options given below :

In chromotography technique, the purification of compound is independent of

Consider the following reaction sequence

The percentage of nitrogen in product 'T' formed is __________ %. (Nearest integer)

Consider the following set of quantum numbers

	\(n\)	\(l\)	\(m_l\)
\(A\)	\(3\)	\(3\)	\(-3\)
\(B\)	\(3\)	\(2\)	\(-2\)
\(C\)	\(2\)	\(1\)	\(+1\)
\(D\)	\(2\)	\(2\)	\(+2\)

The number of correct sets of quantum numbers is ..... .

Let \(a, b\) and \(c\) be distinct positive numbers. If the vectors \(a \hat{i}+a \hat{j}+c \hat{k}, \hat{i}+\hat{k}\) and \(c \hat{i}+c \hat{j}+b \hat{k}\) are co-planar, then \(\mathrm{c}\) is equal to:

Consider the following sequence of reactions.

Assuming that the reaction proceeds to completion, then 137 mg of 4-nitrotoluene will produce _________ mg of B .
(Given molar mass in \(g~mol ^{-1} H : 1, C : 12, N: 14\), O : \(16, Br : 80\) )

Consider the following cases of standard enthalpy of reaction \(\left(\Delta \mathrm{H}_{\mathrm{r}}^{\circ}\right.\) in \(\left.\mathrm{kJ} \mathrm{mol}{ }^{-1}\right)\)
\(\mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})+\frac{7}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_2(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \Delta \mathrm{H}_1^{\circ}=-1550 \)
\( \mathrm{C} \text { (graphite) }+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g}) \quad \Delta \mathrm{H}_2^{\circ}=-393.5 \)
\( \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \quad \Delta \mathrm{H}_3^{\circ}=-286\)
The magnitude of \(\Delta \mathrm{H}_{f \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})}^{\circ}\) is _______ \(\mathrm{kJ} \mathrm{mol}{ }^{-1}\) (Nearest integer).

The correct order of stability of given carbocation is :

The element that does \(NOT\) show catenation is

The area (in sq. units) of the region \(A\,\, = \,\left\{ {\left( {x\,,\,y} \right)\,:\,{x^2}\, \le \,y\, \le \,x + 2} \right\}\) is