Revisiting Tautomerism

Q. Which of the following has the most acidic hydrogen?

1. 3-Hexanone
2. 2, 4-Hexanedione
3. 2, 5-Hexanedione
4. 2, 3-Hexanedione

Q. Write structures of the products of the following reactions:

A
B
C

Q. pH of $0.05M\left(C{H}_{3}COO{)}_{2}Ca\right(p{K}_a=4.74)$ is –

1. 8.87
2. 7
3. 1.3
4. 8.72

Q. 23. Which of following will undergo aldol condensation ? (a)2, 2-dimethyl propanal (b)2-methyl butanal (c)2, 2, 4-trimethyl pentan-3-one (d)2-methyl cyclohexanone

Q. Which of the following is a dynamic isomerism?

1. Tautomerism
2. Metamerism
3. Optical isomerism
4. Geometrical isomerism

Q. Which of the following molecule does not exhibit tautomerism?

1. 
2. 
3. 
4. 

Q. what are oxo acids??
or more specificaly wahat are acid protons, hydoxyl groups ...explain the definition please

Q.

1. True
2. False

Q. Which of the following represents tautomerism?

1. 
2. 
3. 
4. None of the above.

Q. The strongest acid among the following acids is :

1. $C{H}_{3}COOH$
2. $(C{H}_3{)}_{2}CHCOOH$
3. $HCOOH$
4. $(C{H}_3{)}_{3}CCOOH$

Q. The correct order of acid strength is:

1. CH₃COOH > CH₂ClCOOH > CHCl₂COOH
2. CHCl₂COOH > CH₃COOH > CH₂ClCOOH
3. CHCl₂COOH > CH₂ClCOOH > CH₃COOH
4. CH₂ClCOOH > CH₃COOH > CHCl₂COOH

Q. Benzaldehyde reacts with ammonia to give

1. Benzamide
2. Hydrobenzamide
3. Benzoic acid
4. Urotropine

Q. 55.A nitro group in the para or ortho to the amino group decreases the basicity of the -NH2 group by (1) destabilising the corresponding anilinium ion (2)stabilizing the parent amine (3) both of the above factors (4) none of the above statement is correct

Q. Arrange the following according to indicated properties:

• CH3Cl, CH3Br, CH3CH2Cl, , (CH3)2CHCl (S N2 REACTIVITY)
• 4 -nitrophenol , phenol , 2, 4, 6 -trinitrophenol (ACIDIC STRENGTH)
• Phenol , o -nitrophenol , o -cresol (ACIDIC STRENGTH)
• Pentan - 1 -ol , n-butane , pentanal , ethoxyethane (BOILING POINT)
• Pentan -1 -ol, butan -1 -ol, butan -2 -ol, ethanol, propane -1 -ol, methanol (BOILING POINT)
• CH3OH , H2O, C6H5OH (pKavalue)

Q. Strongest acid among the following :

1. $HClO$
2. $HCl{O}_2$
3. $HCl{O}_4$
4. $HCl{O}_3$

Q. $H_{3}P{O}_4+H_{2}O\to H_3{O}^{+}+H-2P{O}_4^{-};p{K}_1=2.15H_{2}P{O}_4^{-}+H_{2}O\to H_3{O}^{+}HP{O}_4^{2-};p{K}_2=7.20$ Hence pH of 0.01 M $Na{H}_{2}P{O}_4$ is:

1. 9.35
2. 4.675
3. 2.675
4. 7.350

Q. Which of the following cannot show tautomerism ?

1. Vinyl alcohol
2. 2-Methyl-2-nitropropane
3. 2-Nitropropane
4. 1-Nitropropane

Q. Which of the following has the most acidic hydrogen?

1. 3-Hexanone
2. 2, 4-Hexanedione
3. 2, 5-Hexanedione
4. 2, 3-Hexanedione

Q. The main reason for the fact that carboxylic acids can undergo ionization is:

1. absence of $\alpha -$H atom
2. resonance stabilization of carboxylate ion
3. high reactivity bonding
4. hydrogen bonding

Q. $Ph-C\equiv C-C{H}_3\stackrel{H{g}^{2+},H^{+}}{\to }A$ 'A' is

1. 
2. 
3. 
4. 

Q. Arrange the following in increasing order of pH value

1. II < I < III
2. III < II < I
3. II < III < I
4. III < I < II

Q. Which of the following represents tautomerism?

1. 
2. 
3. 
4. None of the above.

Q. $Ph-C\equiv C-C{H}_3\stackrel{H{g}^{2+},H^{+}}{\to }A$ 'A' is

1. 
2. 
3. 
4. 

Q. $C{H}_{3}COOEt$ $\underset{Excess}{\stackrel{C{H}_{3}MgBr}{\to }}P$

1. 
2. 
3. 
4. 

Q. $Ph-C\equiv C-C{H}_3\stackrel{H{g}^{2+},H^{+}}{\to }A$ 'A' is

1. 
2. 
3. 
4. 

Q. The correct order of acid strength is:

1. $C{H}_{3}COOH>C{H}_{2}ClCOOH>CHC{l}_{2}COOH$
2. $CHC{l}_{2}COOH>C{H}_{2}ClCOOH>C{H}_{3}COOH$
3. $CHC{l}_{2}COOH>C{H}_{3}COOH>C{H}_{2}ClCOOH$
4. $C{H}_{2}ClCOOH>C{H}_{3}COOH>CHC{l}_{2}COOH$

Q. Tautomers are?

1. readily interconvertible but a catalyst is required
2. not interconvertible at all
3. readily interconvertible without any catalyst
4. in some cases interconvertible and in some other cases not interconvertible

Q. $500$ mL of $0.01M$ ${CH}_{3}COOH+500$ mL of $0.02M$ ${CH}_{3}COONa$ gives a $pH$ equal to $5.3010$. The $p{K}_b$ of ${CH}_{3}CO{O}^{-}$ is: