NTA JEE Mains 24th Jan 2025 Shift 2

In Carius method of estimation of halogen, $$0.25\,g$$  of an organic compound gave  $$0.15\,g$$  of silver bromide $$(AgBr).$$ The percentage of Bromine in the organic compound is $$\underline{\hspace{2cm}}\times 10^{-1}$$ (Nearest integer). }[ Given: Molar mass of Ag is 108 and Br is 80 g  $$mol^{-1}$$]

The observed and normal molar masses of compound  $$MX_2$$ are  $$65.6$$  and  $$164$$  respectively. The percent degree of ionisation of  $$MX_2$$  is  $$\underline{\hspace{2cm}}\%.$$  (Nearest integer)

Consider a complex reaction taking place in three steps with rate constants $$k_1,\; k_2 \text{ and } k_3$$ respectively. The overall rate constant  $$k$$ is given by $$k=\sqrt{\frac{k_1k_3}{k_2}}$$. If the activation energies of the three steps are $$60,\;30$$  and  $$10\,kJ\,mol^{-1}$$  respectively, then the overall energy of activation in  $$kJ\,mol^{-1}$$ is  $$\underline{\hspace{2cm}}.$$ (Nearest integer)

$$\text{The possible number of stereoisomers for 5-phenylpent -4-en-2-ol is } \underline{\hspace{2cm}}.$$

The hydrocarbon  $$(X)$$  with molar mass  $$80\,g\,mol^{-1}$$ and  $$90\% $$ carbon has $$\underline{\hspace{2cm}}$$  degree of unsaturation.