Haloacids

Q. $HBr$ and $HI$ reduce sulphuric acid, $HCl$ can reduce $KMn{O}_4$ and $HF$ can reduce :

1. $H_{2}S{O}_4$
2. $KMn{O}_4$
3. $K_{2}C{r}_2{O}_7$
4. None of the above

Q. Assertion (A): $C{H}_{3}C{H}_{2}OH$ can be converted into $C{H}_{3}CHO$ by treatment with pyridinium chlorochromate.

Reason (R): PCC is a better reagent for oxidation of primary alcohols to aldehydes.
[1 Mark]

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is NOT the correct explanation of A
3. A is true but R is false
4. A is false and R is True

Q. Which of the following is the correct statement regarding $BOH$ (where $X$ is electronegativity)?

1. If $X_O⎯X_B>X_O⎯X_H$, $BOH$ will be basic
2. If $X_O⎯X_B<XO⎯XH$, $BOH$ will be acidic
3. If $X_O⎯X_B>X_O⎯X_H$, $BOH$ will be acidic
4. If $X_O⎯X_B<X_O⎯X_H$, $BOH$ will be basic

Q. The most suitable reagent for the following conversion
$RC{H}_{2}OH\stackrel{\text{PCC in}C{H}_{2}C{l}_2}{\to }RCHO$

1. $KMn{O}_4$
2. $K_{2}C{r}_2{O}_7$
3. $PCC$
4. None of the above

Q. Which reagent is best-suited accomplished the given reaction?

1. 
   $LiAl{H}_4$
2. 
   $PCC$
3. $K_{2}C{r}_2{O}_7/H_{2}S{O}_4$
4. 
   $KMn{O}_4$

Q.

Assertion: $p$-Nitro phenol is a stronger acid than $o$-nitro phenol.

Reason: Intramolecular hydrogen bonding makes ortho-isomer weaker acid than para-isomer.

1. Both Assertion and Reason are false.

2. Assertion is true, but Reason is false.

3. Both Assertion and Reason are true. The reason is the correct explanation of Assertion.

4. Both Assertion and Reason are true. The reason is not the correct explanation of Assertion.

Q. HF is weak acid in comparison to HBr, HCl and HI due to

1. Weak van der Waals force
2. Hydrogen bonding
3. Back bonding
4. High electronegativity of ‘F’

Q. Assertion :With the help of redox titration, we can determine the the concentration of unknown solution using a standard solution of known concentration Reason: We can determine the unknown concentration using the formula : $N_1{V}_1=N_2{V}_2$.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Which of the following is not an oxo-acid of nitrogen?

1. Nitrous acid
2. Nitric acid
3. Hyponitrous acid
4. Hydrazine

Q. Which one of the following undergoes reaction with $50\%$ sodium hydroxide solution to give the corresponding alcohol and acid?

1. Phenol
2. Benzaldehyde
3. Butanal
4. Benzoic acid

Q. $HF$ is liquid at room temperature and $HCl$ is as gas at room temperature because H-bonding is present in $HF$.

1. False
2. True

Q. HF is weak acid in comparison to HBr, HCl and HI due to

1. Weak van der Waals force
2. Hydrogen bonding
3. High electronegativity of ‘F’
4. Back bonding

Q. In the preparation of $HBr$ or $HI,NaX(X=Br,I)$ is treated with $H_3{PO}_4$ and not by conc. $H_2{SO}_4$ and since:

1. ${Na}_2{SO}_4$ is water soluble
2. ${Na}_3{PO}_4$ is water soluble
3. $H_2{SO}_4$ makes the reaction reversible
4. $H_2{SO}_4$ oxidises $HX$ to $X_2(Br,I)$

Q.

Which of the following hydracids is the strongest acid?

1. HCl

2. HF

3. HBr

4. HI

Q. Which reaction can't be used for the preparation of the given halogen acid?

1. $2KBr+H_{2}S{O}_4\left(conc\right)⟶K_{2}S{O}_4+2HBr$
2. $2NaCl+H_{2}S{O}_4\left(conc\right)⟶N{a}_{2}S{O}_4+2HCl$
3. $NaHS{O}_4+NaCl⟶N{a}_{2}S{O}_4+HCl$
4. $Ca{F}_2+H_{2}S{O}_4\left(conc\right)⟶CaS{O}_4+2HF$

Q. Which can undergo haloform reaction?

1. Acetophenone
2. ${\left(C_2{H}_5\right)}_{2}C=O$
3. ${\left({CH}_3\right)}_{3}C-OH$
4. Benzophenone

Q. $HBr$ and $HI$ reduce sulphuric acid, $HCl$ can reduce $KMn{O}_4$ and $HF$ can reduce :

1. $H_{2}S{O}_4$
2. $KMn{O}_4$
3. $K_{2}C{r}_2{O}_7$
4. None of the above

Q. In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which $\alpha$ - hydrogen has been replaced by halogen. This reaction is known as:

1. Etard reaction
2. Hell-Volhard_Zelinsky reaction
3. Rosenmund reaction
4. Wolff-Kishner reaction

Q. 2 mol of $FeS{O}_4$ in acid medium is oxidized by $x$ mol of $KMn{O}_4$, whereas 2 mol of $Fe{C}_2{O}_4$ in acid medium is oxidized by $y$ mol of $KMn{O}_4$. The ratio of $x$ and $y$ is :

1. $\frac{1}{3}$
2. $\frac{1}{2}$
3. $\frac{1}{4}$
4. $\frac{1}{5}$

Q. Which reaction can't be used for the preparation of the given halogen acid?

1. $2KBr+H_{2}S{O}_4\left(conc\right)⟶K_{2}S{O}_4+2HBr$
2. $2NaCl+H_{2}S{O}_4\left(conc\right)⟶N{a}_{2}S{O}_4+2HCl$
3. $NaHS{O}_4+NaCl⟶N{a}_{2}S{O}_4+HCl$
4. $Ca{F}_2+H_{2}S{O}_4\left(conc\right)⟶CaS{O}_4+2HF$

Q. HF is weak acid in comparison to HBr, HCl and HI due to

1. Weak van der Waals force
2. Hydrogen bonding
3. Back bonding
4. High electronegativity of ‘F’