1. Tardigrade
  2. Question
  3. Chemistry
  4. Which of the following statements is/are correct?

Q. Which of the following statements is/are correct?

Alcohols Phenols and Ethers Report Error

Solution:

(1) Due to $-I$ effect of $Cl$, $4-$chlorophenol is acidic and dissolves in $NaOH$, but (II) is an aryl halide and does not dissolve.
(2) (III) is an acid and dissolves in $NaHCO _{3}$ but (IV) is a phenol and does not dissolve.
(3) Although (V) is a phenol, because of the presence of $\left(3 NO _{2}\right)$ group, it is exceptionally acidic $\left( p K_{ a }=0.38\right)$. So it dissolves in $NaHCO _{3}$, but (VI) is a phenol $\left( p K_{ a }=10.17\right)$ and will not dissolve.
(4) (VII) is a phenol and dissolves in $NaOH$, but (VIII) is an ether; and does not dissolve.

Questions from Alcohols Phenols and Ethers

1. The correct IUPAC name of the organic compound

KEAM 2014

2. Order of acidic nature of the following compounds is

AIIMS 2019

3. Assertion: Phenol reacts with $CH_3I$ in presence of NaOH to form methoxybenzene.
Reason : Phenoxide is better nucleophile than phenol.

AIIMS 2019

4. Assertion : Hydroquinone is more acidic than resorcinol.
Reason : $-OH$ group shows $+I -effect$.

AIIMS 2019

5. Dehydration of which one of the following alcohols produces an alkene exhibiting $cis-trans$ isomerism?

KEAM 2015

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1. If for a certain reaction $\Delta_{r}H$ is $30\, kJ\, mol^{-1}$ at $450 \,K$, the value of $\Delta_{r}S$ (in $JK^{-1}\, mol^{-1})$ for which the same reaction will be spontaneous at the same temperature is

NEET 2020

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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