NEET 2017 Question Paper - Code A Mock Test

It is because of inability of $n{s}^2$ electrons of the valence shell to participate in bonding that:

Predict the correct intermediate and product in the following reaction:
$${\text{CH}}_3-\text{C}\equiv \text{CH}\stackrel{{\text{H}}_2{\text{O, H}}_2{\text{SO}}_4,{\text{HgSO}}_4}{\to }\text{Intermediate (A)}\to \text{Product (B)}$$

Which one of the following statements is not correct?

Which one is the wrong statement?

A gas is allowed to expand in a well insulated container against a constant external pressure of $2.5\text{atm}$ from an initial volume of $2.50\text{L}$ to a final volume of $4.50\text{L}$. The change in internal energy $\Delta U$ of the gas in joules will be: