Halogenation of Alpha Carbon

Q.

The major aromatic product C in the following reaction sequence will be:

1. 

2. 

3. 

4. 

Q. Which of the following ketone will not give yellow precipitate with $NaOH/I_2?$

1. 2-Pentanone
2. Benzophenone
3. Acetone
4. 2-Hexanone

Q. 29.Which of the following alkane(s) cannot be synthesized by the Wurtz reaction in good yield (a) (CH3)2CHCH2CH(CH3)2 (b) (CH3)3CCH2CH2CH2CH3 (c) CH3CH2CH2CH3 (d) (CH3)2CHCH2CH2CH(CH3)2

Q. 32. Nature of K2CO3 is basic because 1. K+ react with water 2. CO32- react with water 3.k+ and CO32- react with water 4.NONE OF THESE

Q. Q. The enthalpy change during the reaction A2(g) + B2(g) → 2AB(g) is Bond energy data are given as follows A – A = x kJ mol–1 B – B = y kJ mol–1 A – B = z kJ mol–1 x + y + z x – y – 2z x + y – 2z x + y – z

Q. Identify the correct combination of true (T) and false (F) of the given three statements.
STATEMENT-1: Acetophenone gives aldol condensation.
STATEMENT-2: Benzaldehyde is more reactive than acetaldehyde towards nucleophilic addition.
STATEMENT-3: Benzophenone has $\alpha -$Hydrogens.

1. TTT
2. FFF
3. TFF
4. TFT

Q. Replacement of $-H$ group by $-S{O}_{3}H$ group in an arene via electrophilic aromatic substitution is called sulphonation.

1. False
2. True

Q. Compound that will not give idoform on treatment with alkali and iodine is :

1. acetone
2. ethanol
3. diethyl ketone
4. isopropyl alcohol

Q. An alkene (A) $C_{16}{H}_{16}$ on ozonolysis gives only one product (B) $C_8{H}_{8O}$. Compound (B) on reaction with $NaOH/I_2$ yields sodium benzoate. Compound (B) reacts with $KOH/N{H}_{2}N{H}_2$ yielding a hydrocarbon (C) $C_8{H}_{10}$. Write the structures of compounds (B) and (C). Based on this information two isomeric structures can be proposed for alkene (A). Deduce their structures. The isomer of (A) which on catalytic hydrogenation ($H_2/Pd-C$) gives a racemic mixture is:

1. cis-2, 3-diphenylbut-2-ene
2. trans-2, 3-diphenylbut-2-ene
3. Both the above options are appropriate candidates for "A"; both isomers on catalytic hydrogenation gives a racemic mixture
4. Neither trans-2, 3-diphenylbut-2-ene nor cis-2, 3-diphenylbut-2-ene

Q. 13) From B₂ H₆ all the following can be prepared except :
$$\begin{gathered} \left(A\right)H_{3}B{O}_3 \\ \left(B\right){\left[B{H}_2{\left(N{H}_3\right)}_2\right]}^{+}{\left[B{H}_4\right]}^{-} \\ \left(C\right)B_2{\left(C{H}_3\right)}_6 \\ \left(D\right)NaB{H}_4 \end{gathered}$$

Q. 74 for the reaction A+3B gives 2C+D, initial moles of A is twice that of B. if at equilibrium moles of B and C are equal, then percent of B reacted is?

Q. Which of the following compounds can undergo haloform reaction?

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

Q. What is standard enthalpy of reaction? How is it related to bond enthalpy?

Q. Discuss the mechanism of chlorination of ethane and alkylation of benzene