AIEEE 2005 Chemistry Question Paper Mock Test

p-cresol reacts with chloroform in alkaline medium to give compound A, which adds $\text{HCN}$ to form compound B. The latter on acidic hydrolysis gives a chiral carboxylic acid. The structure of this carboxylic acid is:

An organic compound having molecular mass $60$ contains $C=20\%,H=6.67\%,N=46.67\%$, and rest Oxygen. On heating, it gives ${\text{NH}}_3$ along with a solid residue that gives a violet color with alkaline copper sulfate. The compound is:

If the bond dissociation energies of $\text{XY},{\text{X}}_2$ and ${\text{Y}}_2$ are in the ratio $1:1:0.5$ and ${\Delta }_{f}H$ for $\text{XY}$ is $-200\text{kJ/mol}$, the bond dissociation energy of ${\text{X}}_2$ will be:

$t_{1/4}$ is the time taken for the concentration of a reactant to drop to $3/4$ of its initial value. If the rate constant is $K$, $t_{1/4}$ is:

Solid ${\text{NH}}_4\text{HS}$ is placed in a flask containing ${\text{NH}}_3$ at $0.50\text{atm}$. It decomposes into ${\text{NH}}_3$ and ${\text{H}}_2\text{S}$. At equilibrium, total pressure is $0.84\text{atm}$. $K_p$ is: