Q. Which compound answer iodoform test?

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A

$CH _{3} OH$

B

$C _{6} H _{5} OH$

C

$C _{6} H _{5} COCH _{3}$

D

$C _{6} H _{5} CH _{3}$

Solution:

compound containing $- COCH _{3}$ or $- CH _{2} CHO$ group answers iodoform test.

Questions from KCET 2022

1. Clathatiates or Cage compounds formed by

2. The eleetron affinity. of halugens follow the order

3. Conductivity of a solution is directly proportional to

4. Which of the following is a Lewis acid ?

5. For the reaction $A+B \rightarrow C+D$, it is found that doubling the concentration of $A$ increases rate 4 times and doubling the concentration of B doubles the reaction rate. What is the overall order of the reaction ?

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2. If $8\,g$ of a non-electrolyte solute is dissolved in $114\, g$ of n-octane to reduce its vapour pressure to $80\%$, the molar mass (in $g \,mol^{-1})$ of the solute is [Given that molar mass of n-octane is $114 \,g\, mol^{-1}]$

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3. An organic compound contains $78 \%$ (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of $C$ is $12, H$ is $1$]

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4. At standard conditions, if the change in the enthalpy for the following reaction is $-109 \,kJ\, mol^{-1}$ $H_{2(g)}+Br_{2(g)} \to 2HBr_{(g)}$ Given that bond energy of $H_{2}$ and $Br_{2}$ is $435\,KJ\,mol^{-1}$ and $192\,KJ\,mol^{-1}$ , respectively, what is the bond energy (in $KJ \,mol^{-1})$ of $HBr$ ?

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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
[Given that molecular mass of NaOH = 40 g mol$^{-1}$]

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