8.2 Carboxylic acids and their derivative — Chemistry STD 12 Science — Question

Assertion $(A):$ Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis.

Reason $(R):$ Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether.

In the light of the above statements, choose the most appropriate answer from the options given below:

$(A)$ Number of lone pairs on oxygen is 2 .

$(B)$ $FOF$ angle is less than $104.5^{\circ}$.

$(C)$ Oxidation state of $O$ is $-2$.

$(D)$ Molecule is bent ' $V$ ' shaped.

$(E)$ Molecular geometry is linear.

Correct options are:

$2 X + Y \xrightarrow{i} P$

the rate of reaction is $\frac{ d [ P ]}{ dt }=k[ X ]$. Two moles of $X$ are mixed with one mole of $Y$ to make $1.0 L$ of solution. At $50 s , 0.5$ mole of $Y$ is left in the reaction mixture. The correct statement(s) about the reaction is(are)

(Use: $\ln 2=0.693$ )

$(A)$ The rate constant, $k$, of the reaction is $13.86 \times 10^{-4} s ^{-1}$.

$(B)$ Half-life of $X$ is $50 s$.

$(C)$ At $50 s ,-\frac{ d [ X ]}{ dt }=13.86 \times 10^{-3} mol L ^{-1} s ^{-1}$.

$(D)$ At $100 s ,-\frac{ d [ Y ]}{ dt }=3.46 \times 10^{-3} mol L ^{-1} s ^{-1}$.