Chemistry 2nd Paper MCQ-Sylhet Board-2022

1. What colour holds phenolphthalein in $\mathrm{HBr}$ solution?

2. The functional group of amide is-

3. Observe the following stem and answer the questions no. 21 and 22:

$\mathrm{M}+\mathrm{M}^{+^{\prime}} \longrightarrow \mathrm{M}^{2+}+\mathrm{M}^{\prime}(\mathrm{s})$

Here, $\mathrm{E}_{\mathrm{M}^{2+} \mathrm{M}}^{0}=+0.34 \mathrm{~V}$ and $\mathrm{E}_{\mathrm{M}^{+}+\mathrm{M}^{\prime}}^{0}=+0.80 \mathrm{~V}$

In case of the cell-

i. the pot of $\mathrm{M}$ will can use

ii. $M^{\prime}$ can substitute hydrogen from acid

iii. the cell reaction will occur spontaneously

Which one is correct?

4. Observe the following stem and answer the question:

$\mathrm{A}+\mathrm{CO}_{2} \longrightarrow \mathrm{RCOOMgX} \xrightarrow[-\mathrm{Mg}_{(\mathrm{OH}) \mathrm{X}}]{\mathrm{H}^{+} / \mathrm{H}_{2} \mathrm{O}} \mathrm{B}$

What compound will be produced between the reaction of compound $A$ and ketone?

5. Which is produce by Haffmann's degradation?