Alcohols as Nucleophiles and Electrophiles

Q. The nitration will mainly take place at position:

1. 1
2. 2
3. 3
4. 4

Q.

$1.86\mathrm{g}$ of aniline completely reacts to form acetanilide. $10\%$ of the product is lost during purification. The amount of acetanilide obtained after purification $\left(\mathrm{in}\mathrm{g}\right)$ is $\mathrm{\_\_\_\_}\times {10}^{–2}$.

Q.

Ethanol when reacted with PCl₅ gives A, POCl₃ and HCl. A reacts with silver nitrite to form B and AgCl . A and B respectively are

1. C₂H₅Cl and C₂H₅NO₂

2. C₂H₆ and C₂H₅NO₂

3. C₂H₆ and C₂H₅OC₂H₅

4. C₂H₅Cl and C₂H₅OC₂H₅

Q. The reagents most suitable for converting primary alcohol into an aldehyde is:

1. $K_{2}C{r}_2{O}_7$ and $H_{2}S{O}_4$

2. $KMn{O}_4$ and $NaOH$

3. 

4. $HN{O}_3$

Q. What is the order of acidity of alcohols and phenols? Explain both in detail.

Q. Formula of caro's acid is

1. $H_{2}S{O}_5$
2. $H_2{S}_2{O}_6$
3. $H_2{S}_2{O}_7$
4. $H_2{S}_2{O}_8$

Q.

Oxymercuration-demercuration of 3, 3-dimethyl but-1-ene gives which alcohol?

1. 2, 3-dimethyl butan-2-ol

2. 3, 3-dimethyl butan-1-ol

3. 3, 3-dimethyl butan-2-ol

4. 2, 3-dimethyl butan-1-ol

Q. Among the following the one that gives positive iodoform test upon reaction with $I_2$ and NaOH is

1. 
2. $PhCH\left(OH\right)C{H}_3$
3. $C{H}_{3}C{H}_{2}CH\left(OH\right)C{H}_{2}C{H}_3$
4. $C_6{H}_{5}C{H}_{2}C{H}_{2}OH$

Q. 50. For the reaction, 2NO(g)+2H2(g) gives N2+2H2O(g) The rate expression can be written in the following ways: d(N2)/dt=k1(NO)(H2); d(H2O)/dt=k2(NO)(H2) -d(NO)/dt=k3(NO)(H2); -d(H2)/dt=k4(NO)(H2) The relationship between k1, k2, k3, k4 is

Q. Amongst the following, HBr reacts fastest with

1. 2-methylpropan-1-ol
2. 2-methylpropan-2-ol
3. Propan-2-ol
4. Propan-1-ol

Q.

Which is true about the acidic character of hydroxyl groups of sugars and hydroxyl group of an alcohol ?

1. The OH's of sugars are less acidic than that of a typical alcohol

2. The OH's of sugars are netral while that of an alcohol is acidic

3. The OH's of sugars are more acidic than that of a typical alcohol

4. Both have similar acidic character

Q.

Consider thiol anion RS^- and alkoxy anion RO^- .Which of the following statements is correct?

1. RS- is more basic and more nucleophilic than RO-

2. RS^- is less basic but more nucleophilic than RO^-

3. RS^- is more basic and less nucleophilic than RO^-

4. RS- is less basic but less nucleophilic than RO-

Q.

Give plausible explanation for each of the following:

(i) Why are amines less acidic than alcohols of comparable molecular masses?

(ii) Why do primary amines have higher boiling point than tertiary amines?

(iii) Why are aliphatic amines stronger bases than aromatic amines?

Q. how to convert propan-2-ol into formaldehyd

Q. Statement I : $H_{2}S{O}_4$ is not used during the reaction of alcohols with $KI$.
Statement II : $H_{2}S{O}_4$ oxidises $KI$ to $I_2$ and will prevent reaction of alcohol with $KI$.

1. Statement I & Statement II are correct and statement II is correct explanation of statement I
2. Statement I is correct and Statement II is wrong
3. Statement I is wrong and Statement II is correct
4. Statement I & Statement II are correct and statement II is not correct explanation of statement I

Q. Which one of the following alcohols is most reactive for $S_{N}1$ reaction?

$\left(a\right)C{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C{H}_3\left(b\right)C_6{H}_5-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C_6{H}_5$
$\left(c\right)C{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C{H}_3\left(d\right)C{H}_3-\stackrel{OH}{\stackrel{|}{C}}-C{H}_3$

1. a
2. b
3. c
4. d

Q. The compound that is most difficult to protonate is:

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Q.

Write the structures of the major products expected from the following reactions:
(a) Mononitration of $3-methylphenol$
(b) Dinitration of $3-methylphenol$
(c) Mononitration of phenyl ethanoate.

Q.

For the reaction, 2N₂O₅ → 4NO₂ + O₂, which of the relationship is correct?

1. 

2. 

3. 

4. 

Q.

Write the reactions of F₂ and Cl₂ with water.

Q. Which one of the following alcohols is most reactive for $S_{N}1$ reaction?

$\left(a\right)C{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C{H}_3\left(b\right)C_6{H}_5-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C_6{H}_5$
$\left(c\right)C{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{OH}{\stackrel{|}{C}}}}-C{H}_3\left(d\right)C{H}_3-\stackrel{OH}{\stackrel{|}{C}}-C{H}_3$

1. $a$
2. $b$
3. $c$
4. $d$

Q.

2- bromo butane $\stackrel{15\%aqsolnofEtOH}{\to }P$
In this reaction 70% recemisation takesplace % of inverted product would be:

1. 65

2. 30

3. 35

4. 70

Q. The decreasing order of nucleophilicity among the nucleophiles is:

1. (b) > (c) > (a) > (d)
2. (d) > (c) > (a) > (b)
3. (d) > (c) > (b) > (a)
4. (a) > (b) > (c) > (d)

Q. Which of the following on heating produces $N{O}_2$?

1. $NaN{O}_3$
2. $N{H}_{4}N{O}_3$
3. $AgN{O}_3$
4. $N{H}_{4}N{O}_2$

Q. Give the correct order of initials T of F for following statements. Use T if statement is true and F if it is false.
(a) $SOC{l}_2,PC{l}_3$ and $HCl$ all converts an alcohol into alkyl halide
(b) Mechanism of all the three reagents are identical
(c) Mechanism for $SOC{l}_2$ and $PC{l}_3$ are identical but a differnt mechanism is followed in case of $HCl$
(d) They all are used commercially to convert acetic acid into acetyl chloride

1. TTFT
2. TFFF
3. TFFT
4. TFTF

Q. Ethanol is converted into ethyl chloride by reacting with

1. $C{l}_2$
2. $NaCl$
3. $SOC{l}_2/Py$
4. $HCl$

Q.

1. No reaction

2. RNH₂ + HX

3. R-H + NH₃

4. R-H + NH-X

Q. Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
(a) $SOC{l}_2,PC{l}_3$ and $HCl$ all converts an alcohol into alkyl halide
(b) Mechanism of all the three reagent are identical
(c) A mechanism for $SOC{l}_2$ and $PC{l}_3$ are identical but different mechanism is followed in case of HCl
(d) They all are used commercially to convert acetic acid into acetyl chloride.

1. TTFT
2. TFFF
3. TFTF
4. TFFT

Q. which is more acidic alcohols or phenols and why?

Q. In the reaction $N{H}_3+H_{2}O\to N{H}_4^{+}+O{H}^{-}$

1. $N{H}_3$ is the conjugate base of the acid $O{H}^{-}$
2. $H_{2}O$ is the conjugate acid of the base $N{H}_3$
3. $N{H}_3$ is the conjugate acid of the base $N{H}_4^{+}$
4. $N{H}_3$ is the conjugate base of the $N{H}_4^{+}$