Hydrohalogenation of Alkenes

Q.

Addition of $HCl$ to vinyl chloride gives 1, 1-dichloroethane because of

1. Restricted rotation around double bond

2. Mesomeric effect of Cl

3. None of these

4. Inductive effect of Cl

Q.

Reagent that takes away an electron pair is called as:

1. Carbocation

2. Nucleophile

3. Carbanion

4. Electrophile

Q.

2-Bromo-3-methyl butane on treatment with alcoholic KOH forms 2-Methyl-2-butene.The product formed is in accordance with which rule:

1. Huckel's rule

2. Markovnikov's rule

3. Saytzeff rule

4. Anti-Markovnikov's rule

Q. How to determine whether a compound is planar or not

Q.

In which of the following, addition of HBr does not take place against Markownikoff's rule? In other words, Anti- Markownikoff's addition of HBr is not observed for

1. Propene

2. But - 1 - ene

3. But - 2- ene

4. Pent - 2 - ene

Q.

Ethene$\to$ Benzene; The sequence of reagents required for this conversion is

1. Br₂ / CCl₄. KOH (alc), Fe / 873 K

2. HBr, KOH (aq), Fe / 873K

3. Br₂ / CCl₄. KOH (aq), NaNH₂

4. HBr, NaNH₂, O₂ / 200⁰C, 1500 - 2000 atm

Q. 18. What is hydride. Can water be called oxygen dihydride

Q. 16. In a chemical reaction, caco3+2hcl= cacl2 +co2+h2o. 25ml hcl and 0.75M Calculate the amount of caco3

Q.

In wurtz reaction in the preparation of alkanes metallic sodium acts as

1. Dehydrogenating agent

2. Dehyrohalogenating agent

3. Oxidising agent

4. Reducing agent

Q.

Formation of 2-butene as major product by dehydration of 2-butanol is according to

1. Saytzeff rule

2. Peroxide effect

3. Anti-Markownikoff rule

4. Markownikoff rule

Q.

Which one of the following series contain electrophiles only?

1. H₂O, SO₃, H₃O⁺

2. NH₃, H₂O, AlCl₃

3. AlCl₃, SO₃NO₂₊

4. H₂O, Cl⁺, NH₃

Q. The reaction of toluene with $C{l}_2$ in presence of $FeC{l}_3$ gives predominantly

1. benzyl chloride
2. O and p – chlorotoluene
3. m – chlorotoluene
4. benzoyl chloride

Q.

what is the structural difference between I₂Cl₆ and Al₂Cl₆ ??

Q.

Addition reaction takes place in unsymmetrical alkynes according to:

1. Kharasch effect

2. Anti Markovnikov rule

3. Peroxide effect

4. Markovnikov rule

Q.

Read the statements given below and choose the correct statements.

a) Sodium chloride is more soluble in heavy water than in normal water.

b) Heavy water is used to study the reaction mechanism.

c) $A{l}_4$$C_3$ on duterolysis gives duetero methane.

d) Heavy water is more viscous than water.

1. Only a, b and c are correct

2. All are correct

3. Only b and c are correct

4. Only b, c and d are correct

Q. In which of the following reactions is a carbocation rearrangement possible?

1. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HCl,0^{\circ }C}{\to }$
2. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HBr,0^{\circ }C}{\to }$
3. $Ph-C{H}_2-CH=C{H}_2\stackrel{HBr}{\to }$
4. All of these

Q.

Conversion of $C{H}_4$ to $C{H}_{3}Cl$ is an example of which of the following reaction

1. Electrophilic substitution

2. Free radical addition

3. Free radical addition

4. Free radical substituion

Q.

Peroxide effect of addition of HBr to an alkene occurs through a stable:

1. Carbocation

2. Carbanion

3. Carbon radical

4. Carbene

Q. The correct statement about bromination of benzene is (1) It form π- complex (2) It form sigma- complex (3) It neither form π - complex nor sigma - complex (4) Both (1) & (2)

Q.

The function of AlCl₃ in the Friedel Crafts reaction is:

1. To produce an electrophile

2. To absorb hydrochloric acid

3. To absorb water

4. To produce a nucleophile

Q.

Compounds A, B and C, respectively are:

1. 
2. 
3. 
4. 

Q. Markovnikov’s rule:

Alkenes undergo electrophilic addition reactions. They are triggered by the acid acting as an electrophile toward the π-electrons of the double bond.

Markovnikov’s rule states that when an unsymmetrically substituted alkene reacts with a hydrogen halide, the hydrogen atom adds to the carbon that has a greater number of hydrogens, e.g.,


Which given substrate is the most reactive toward Markovnikov’s addition?

1. 
2. 
3. 
4. 

Q.

n -heptane $\underset{773K}{\overset{V_2{O}_3\left(or\right)C{r}_2{O}_3}{\to }}$ Hydrocarbon (A). In this reaction the compund 'A' and the process called are

1. Benzene, Isomerisation

2. C₆H₆, reforming

3. Toulene, Isomerisation

4. Toulene, Aromatization

Q. The correct reactivity order of following C = C / $C\equiv$ C bonds towards $B{r}^{\oplus }$ is:

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

Q. $CH\equiv CH+HBr⟶X$, product $X$ is

1. ethylene bromide
2. bromo ethane
3. vinyl bromide
4. ethyledine bromide

Q.

Addition of dihydrogen to propyne forms:

1. Substitution reaction

2. Elimination reaction

3. Halogenation reaction

4. Displacement reaction

Q. In acetic formic anhydride, no. of carbon in parent chain is

Q. arrange the following compounds in decreasing order of acidity water alcohol alkene

Q. The correct reactivity order of following C = C / $C\equiv$ C bonds towards $B{r}^{\oplus }$ is:

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

Q.

NO₂ can be obtained from

1. Ca(NO₃)₂

2. Hg(NO₃)₂

3. AgNO₃

4. NaNO₃