Hydrocarbons · Question 13

The incorrect method for the synthesis of alkenes is

1. Treating vicinal dihalides with Zn metal
2. Treating of alkynes with Na in liquid NH3
3. Heating alkyl halides with alcoholic KOH
4. Treating alkyl halides in aqueous KOH solution

The major product of the following chemical reaction is : [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

CH3CH2COO-Na+ [Heat]NaOH, +? CH3CH3 + Na2CO3 Consider the above reaction and identify the missing reagent/chemical.

1. DIBAL-H
2. B2H6
3. Red Phosphorus
4. CaO

Which of the following alkane cannot be made in good yield by Wurtz reaction?

1. 2, 3-Dimethylbutane
2. n-Heptane
3. n-Butane
4. n-Hexane

An alkene on ozonolysis gives methanal as one of the products, Its structure is :

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Among the following, the reaction that proceeds through an electrophilic substitution, is :

1. [figure]
2. [figure]
3. [figure]
4. [figure]

The most suitable reagent for the following conversion, is : [figure]

1. Zn / HCl
2. Hg2+/H+, H2O
3. Na / liquid NH3
4. H2, Pd/C, quinoline

An alkene “A” on reaction with O3 and Zn + H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is :

1. H3C-CH2- Cl | CH3 |C-CH3
2. H3C- Cl |CH- CH3 | CH3 |CH
3. Cl-CH2-CH2- CH3 | CH3 |CH
4. H3C-CH2- CH2Cl |CH-CH3

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

1. CH CH
2. CH2 = CH2
3. CH3 - CH3
4. CH4

Predict the correct intermediate and product in the following reaction : H3C-C CH [HgSO4]H2O, H2SO4 (A)Intermediate (B)Product

1. A : H3C- OH |C=CH2 B : H3C- SO4 |C=CH2
2. A : H3C- O \|C-CH3 B : H3C-C CH
3. A : H3C- OH |C=CH2 B : H3C- O \|C-CH3
4. A : H3C- SO4 |C=CH2 B : H3C- O \|C-CH3