Acidity of Alcohols and Phenols

Q. 15. Consider the reactions the mechanism of reaction 1 and 2 are respectively 1) SN2 and SN2 2) SN2 and SN1 3) SN1 and SN2 4) SN1 and SN1

Q. Kp for a reaction PCl5 gives PCl3+Cl2 at 250^°C is 0.82.calculate the degree of dissociation at given temperature under a total pressure of 5atm

Q. 93 0.4 g of an organic compound was kjeldahlised and the ammonia evolved was absorbed into 50 mL of M/4 sulphuric acid solution. The residual acid solution was diluted with distilled water and the volume was made upto 150 mL. 20 mL of this diluted solution required 31 mL of M/20 NaOH solution for complete neutralization. Calculate the percentage of nitrogen in the compound.

Q.

ClCH₂CH₂OH is stronger acid than CH₃CH₂OH because of:

1. -I effect of Cl increases -ve charge on O atom of alcohol

2. -I effect of Cl disperses -ve charge on O atom to produce more stable cation

3. -I effect of Cl disperses -ve charge on O atom to produce more stable anion

4. None of these

Q.

Which concept best explains that o-nitrophenol is more volatile than p-nitrophenol

1. Hydrogen bonding

2. Resonance

3. Hyperconjugation

4. Steric hindrence

Q. Markovnikovs rule is applicable to Ch2=ch2 Ch3-ch2-ch3 Ch3-ch=ch-ch3 (Ch3) 2-c=c-(ch3) (c2h5)

Q.

An unknown compound 'A' has a molecular formula $C_4{H}_6$. When 'A' is treated with excess of $B{r}_2$ a new substance with molecular formula $C_4{H}_{6}B{r}_2$ formed. 'A' forms a white precipitate with Tollen's reagent. Then 'A' may be

1. but-1-yne

2. but-2-yne

3. but-1-ene

4. but-2-ene

Q. 42. Consider the following reactions The mechanisms of reactions (i) and (ii) are respectively 1) Sn1 and Sn2 2) Sn1 and Sn1 3) Sn2 and Sn2 4) Sn2 and Sn1

Q. Q 4/15 The strength of 30 volume of hydrogenperoxide is

Q. What is the oxidation state of phosphorus in hypophosphoric acid?

1. $+2$
2. $+1$
3. $+3$
4. $+4$

Q. explain why: o-nitro phenol is more volatile than p-nitro phenol.

Q.

Phenol is less acidic than [IIT-JEE 1986; UPSEAT 2003; Orissa JEE 2004]

1. Acetic acid

2. p-nitrophenol

3. Both (a) and (b)

4. None of these

Q. Which among the following alcohols is most reactive with sodium wire?

1. Ethanol
2. 2 –propanol
3. 2-hexanol
4. 2 –Methyl– 2 – butanol

Q. Which of the following will not react with $NaOH?$

1. 
   
2. $C_2{H}_{5}OH$
3. $C{H}_{3}CON{H}_2$
4. $CH(CN{)}_3$

Q. 34. What will be the number of products if excess of C(n)H(2n+1) is reacted with Cl2 in the presence of sunlight?

Q. Which of the following is true for solubility of a solid in a liquid ?

1. Generally, polar solutes readily dissolve in non-polar solvents.
2. Generally, polar solutes readily dissolve in polar solvents.
3. Solubility is not affected by changing temperature of the system
4. None of the above

Q. Which of the following will not react with $NaOH?$

1. 
   
2. $C_2{H}_{5}OH$
3. $C{H}_{3}CON{H}_2$
4. $CH(CN{)}_3$

Q. Why there is no angulat strain in red p4

Q. The decreasing order of acidic character of the following is:
I. $C{H}_{3}SH$ II. $C{H}_{3}OH$ III. $H_{2}O$ IV. EtOH

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

Q. HF +H2O -k1-> H3O+ + F- F- + H2O -K2-> HF + OH- For the above 2 reactions which of these relations is correct? 1] Kw = K1K2 2] Kw = K1/K2

Q. arrange the following set of compounds in increasing order of decreasing reactivity of electrophiles
chlorobenzene, 2, 4-dinitrobenzene p-nitrochlorobenzene

Q.

Pb3O4+ 8 HCL GIV 3 PBCL2 +CL2+4H2O

PB3O4+4HNO3 GIV 2PB(NO3)2+PBO2+2H2O

WHICH OF THE PROCEED DIFFERENTLY.