Hydrocarbons · Question 15

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

Consider the nitration of benzene using mixed conc. H2SO4 and HNO3. If a large amount of KHSO4 is added to the mixture, the rate of nitration will be

1. unchanged
2. doubled
3. faster
4. slower

In the reaction H-C CH [(ii) CH3CH2Br](i) NaNH2/liq. NH3 X [(ii) CH3CH2Br](i) NaNH2/liq. NH3 Y, X and Y are

1. X = 2-Butyne, Y = 2-Hexyne
2. X = 1-Butyne, Y = 2-Hexyne
3. X = 1-Butyne, Y = 3-Hexyne
4. X = 2-Butyne, Y = 3-Hexyne