The outer electronic configuration of Gd (At. No. 64) is

$\begin{matrix}
O \\
|| \\
H-C-H, \\
\end{matrix}\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,O\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,||\,\,\,\,\, \\
H-C-C{{H}_{2}}-C-C-C{{H}_{3}}, \\
\end{matrix}\begin{matrix}
\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O \\
\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|| \\
C{{H}_{3}}-C-C{{H}_{2}}-C-H \\
\end{matrix}$

aalkene $(A)$ will be ?

→

$0.3\,g$ of ethane undergoes combustion at $27^{\circ}\,C$ in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by $0.5^{\circ}\,C$. The heat evolved during combustion of ethane at constant pressure is $.......kJ\,mol { }^{-1}$.

(Nearest integer)

[Given : The heat capacity of the calorimeter system is $20\, kJ\, K ^{-1}, R =8.3\, JK ^{-1}\, mol ^{-1}$.

Assume ideal gas behaviour.

Atomic mass of $C$ and $H$ are $12$ and $1\, g\, mol ^{-1}$ respectively]

→

The reaction of sodium acetate with acetyl chloride proceeds through which of the following mechanisms ?

→

For a reaction for which the activation energies of the forward and reverse directions are equal in value then

→