Chemical Properties of Alcohol

Q. Excess of KI reacts with 25ml H_2O_2 solution to produce iodine . The liberated iodine requires 10ml of 0.3N sodium thiosulphate solution for complete reaction .Find the normality of H_2O_2

Q. The reagents that can be used to convert benzene diazonium chloride to benzene are ________________.

1. $LiAl{H}_4$
2. $H_{3}P{O}_2$
3. $SnC{l}_2/HCl$
4. $C{H}_{3}C{H}_{2}OH$

Q.

$C{H}_{3}C{H}_{2}OH+HCl\stackrel{ZnC{l}_2}{\to }C{H}_{3}C{H}_{2}Cl+H_{2}O$ In the above reaction, the leaving group is ?

1. $O{H}^{-}$

2. $H_{2}O$

3. $HO-Z\stackrel{\ominus }{n}C{l}_2$

4. $H_3{O}^{+}$

Q.

Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds Benzene, methyl benzene, Chlorobenzene, nitro benzene:

1. 2>1>4>3

2. 1>2>3>4

3. 4>3>2>1

4. 2>1>3>4

Q. which factors increasre reactivity towards electrophilic substitution reaction does resonance and conjugation also increse its rate towards ESR taking the cases of pyridine, pyrole and benzene

Q. 50 mL of a gaseous hydrocarbon is mixed with excess of oxygen and burnt and cooled to the laboratory temperature.The reduction in volume was found to be 150mL. The gas is then passed through caustic potaash, when there is a further reduction of 150mL. Provided all the volumes are measured at same conditions of temperature and pressure, find out the molecular formula of the hydrocarbon.

Q.

Which of the following reagents could be used to distinguish between prop-2-en-1-ol and propan-1-ol?

1. Lucas reagent

2. $ZnC{l}_{2}andconc.HCl$

3. A Cr(VI) reagent like $H_{2}Cr{O}_4$

4. Benzene

Q. why C6H5COCH3 is least reactive to the nucliophilic substitution reaction ?

Q. $C{H}_{3}C{H}_{2}OH+HCl\stackrel{ZnC{l}_2}{\to }C{H}_{3}C{H}_{2}Cl+H_{2}O$
In the above reaction, the leaving group is:

1. $HO\stackrel{\ominus }{Zn}C{l}_2$
2. $H_{2}O$
3. $H{O}^{\ominus }$
4. $H_3{O}^{\oplus }$

Q. Which of the following does not decolorize iodine? (1) Na2SO3 (2). Na2S2O3 (3). NaCl (4). NaOH

Q. An unknown compound A having $MF{C}_6{H}_{12}{O}_6$ on acetylation gives acetylated product whose MW is $390$ The number of hydroxyl groups in A is:

1. Four
2. Five
3. Six
4. Three

Q.

Glycerol is used in the manufacture of [SCRA 1991]

1. Dynamite

2. Varnish

3. Paints

4. Soft drinks

Q.

Distinction between primary, secondary and tertiary alcohol is done by [MP PMT/PET 1988; RPMT 2000]

1. Oxidation method

2. Lucas test

3. Victor Meyer method

4. All of these

Q. Select the correct options with respect to the reaction of cis-3-methylcyclopentanol with Lucas reagent:

1. The reaction is $S_{N}2$
2. The reaction is $S_{N}1$
3. A pair of enantiomers are formed
4. A pair of diastereomers are formed

Q. An organic compound $A\left(C_{10}{H}_{18}{O}_8\right)$ on treatment with excess of $C{H}_{3}COCl$ gives a fully acetylated product whose molar mass is found to be $518\text{g/mol}$. How many hydroxyl functional groups are present in A?

Q. Which of the following alcohols will give carboxylic acid and iodoform on oxidation with $NaOI?$

1. 2 –Propanol
2. Cyclopentanol
3. 3 – Hexanol
4. Cyclohexanol

Q. Identify the correct order of boiling points of the following compounds:
1. $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}OH$
2. $C{H}_{3}C{H}_{2}C{H}_{2}CHO$
3. $C{H}_{3}C{H}_{2}C{H}_{2}COOH$

1. $1>2>3$
2. $3>1>2$
3. $1>3>2$
4. $3>2>1$

Q.

Following compounds are given

Which of the above compounds on being warmed with iodine solution and NaOH will give Iodoform?

1. I, III and IV

2. Only II

3. I, II and III

4. I and II

Q.

Following compounds are given

Which of the above compounds on being warmed with iodine solution and NaOH will give Iodoform?

1. I, III and IV

2. Only II

3. I, II and III

4. I and II

Q.

Addition of HBr to propene yields 2-bromopropane, while in the presence of benzoyl peroxide, the same reaction yields 1-bromopropane. Explain and give mechanism.

Q. Which of the following statements are correct for the given reaction:
$R-OH\stackrel{X^{\theta }}{\to }R-X+\stackrel{\theta }{O}H$

1. Reaction will not take place because is poor leaving group; $X^{\theta }$ is weak base.
2. Reaction will not take place because $O{H}^{-}$is poor leaving group and
   $X^{\theta }$ is strong base.
3. Reaction will take place because $O{H}^{-}$is poor leaving group and ​ $X^{\theta }$ is weak base whereas is
   strong base.
4. Reaction will take place because $O{H}^{-}$ is good leaving group, ​ $X^{\theta }$ is weak base and is strong base.

Q.

calculate sandard enthalpy of formation of CH3OH from:

CH3OH + 3/2O2 ---- CO2 + 2H2O delta r H = -726 Kj/Mol

C + O2 ---- CO2 dlta fH = -393.5 Kj/mol

H2 + 1/2O2 ----- H2O dlta fH = -286 Kj/Mol

Q. Give the decreasing order of the reaction rates of the following benzyl alcohol with $HBr$.

1. $I>II>III>IV$
2. $IV>I>III>I$
3. $II>I>III>IV$
4. $IV>III>I>II$

Q. the groups that we say are deactivating groups or activating are for electrophilic substitutions only? In case of nucleophilic substitution samee groups wont have same activation or deactivation??

Q.

Diethylether may be regarded as an anhydride of:

1. Ethanol

2. Propanoic acid

3. Propanal

4. Ethyl propanoate

Q. Which of the following reactions will go faster if the concentration of the nucleophile is increased?

1. 
2. 
3. 
4.