Introduction to Alkanes

Q.

Write structures of different dihalogen derivatives of propane.

Q. Electrolysis of H2SO4 (conc.) gives the following atanode (1) H2 (2) O2 (3) H2S203 (4) H2S2O8

Q. a unit cell consists of a cube in which there are A atoms at the corners and B atoms at the face centres and A atoms are missing from 2 corners in each unit cell. What is the simplest formula of the compound?

Q. Why are alkane called as paraffins?

1. Little affinity towards a general reagent
2. Alkanes are inert substances
3. They are highly polar in nature.
4. (a) and (b) above.

Q.

Which one of the following compounds is more easily hydrolised by KOH and why ?

CH3CHClCH2CH3 OR CH3CH2CH2Cl

Q. H2CO3 + NaOH = NaHCO3+ H20 Equivalent weight of H2CO3 in the above reaction is

Q. The molecular formula of DDT has

1. 4 chlorine atoms
2. 5 chlorine atoms
3. 2 chlorine atoms
4. 3 chlorine atoms

Q.

The chemical formula of marsh gas (methane) is

1. ${\mathrm{C}}_2{\mathrm{H}}_6$

2. ${\mathrm{CH}}_4$

3. ${\mathrm{C}}_3{\mathrm{H}}_8$

4. ${\mathrm{C}}_4{\mathrm{H}}_{10}$

Q.

LPG is a mixture of

1. 

2. 

3. 

4. 

Q. the order of reactivity towards E2 elimination - 1.Chlorocyclohexane 2. 1- Chlorocyclohex-2-ene 3. 1- Chloro1, methylcyclohexane 4.

Q.

Write the structural formula for chloroethane.

Q.

The property of self combination of carbon atoms is called

Q.

In alkane the bond angle is

1. 

2. 

3. 

4. 

Q. Among the compounds $B{F}_3,NC{l}_3,H_{2}S,S{F}_4\text{and}BeC{l}_2$ identify the ones in which the central atom has the same type of hybridisation.

1. $NC{l}_3\text{and}{H}_{2}S$
2. $H_{2}S\text{and}BeC{l}_2$
3. $S{F}_4\text{and}BeC{l}_2$
4. $B{F}_3\text{and}NC{l}_3$

Q. Methane gives water gas when heated with steam in presence of

1. $Cu$
2. $Al$
3. $Ni$
4. $Zn$

Q. The maximum ease of abstraction of a hydrogen by a chlorine radical is shown in which of the following.

1. $(C{H}_3{)}_{3}C-C{H}_3$
2. $(C{H}_3{)}_{2}C{H}_3$
3. $C_6{H}_{5}C{H}_3$
4. $C{H}_2=CHC{H}_3$

Q. Which of the following(s) is/are primary amine?

1. tert-Butylamine
2. sec-Butylamine
3. Isobutylamine
4. Dimethylamine

Q.
The number of compound(s) which cannot show tautomerism is/are:

Q. Which of the following is correct statement about carbon monoxide?

1. It is highly soluble in water
2. It is a powerful oxidizing agent
3. It increases oxygen carrying ability of blood
4. It is a component of synthesis gas

Q. The general formula of alkane is

1. $C_n{H}_{2n+2}$
2. $C_n{H}_{2n-2}$
3. $C_n{H}_{2n}$
4. $C_n{H}_{2n+4}$

Q. A hydrocarbon, 'X' $\left(C_3{H}_4\right)$ decolourises $B{r}_2/CC{l}_4$ solution forming 'Y'. 'X' gave a red precipitate of a compound 'Z' with ammoniacal cuprous chloride.
X, Y, and Z respectively are:

1. $C{H}_2=C=C{H}_2,C{H}_{2}Br-CB{r}_2-C{H}_{2}Br,C{H}_3-C\equiv C^{-}C{u}^{+}$
2. $C{H}_3-C\equiv CH,C{H}_3-CB{r}_2-CHB{r}_2,C{H}_3-C\equiv C^{-}C{u}^{+}$
3. $C{H}_3-C\equiv CH,C{H}_3-CBr=CHBr,C{u}^{+}C{H}_2^{-}-C\equiv CH$
4. $C{H}_2=C=C{H}_2,C{H}_{2}Br-CH=CHBr;C{H}_3-C\equiv C^{-}C{u}^{+}$

Q.

Q. 1 mole of CH4 on combustion gave 33g CO2 thus % yield is

Q. 5. Explain why CH2=CHCl is least reactive with hydrolysis point of view

Q.

Which of the following gives CH₄ on hydrolysis?

1. Al₂O₃

2. Al₄C₃

3. Fe₃O₄

4. CaC₂

Q.

Which represents an alkane

1. 

2. 

3. 

4. 

Q. The relative stability of the following radicals is

1. i > ii > iii
2. ii > iii > i
3. i > iii > ii
4. iii > i > ii

Q. What is the product obtained in reduction of crotonaldehyde in presence of Ni/H2

Q. Which of the following do not represent tautomers?

1. 
2. 
3. 
4. 

Q.

The stability of given free radicals in decreasing order is

$1)C{H}_3-\dot{C}{H}_{2}2)C{H}_3-C\dot{H}-C{H}_{3}3)C{H}_3-\dot{C}-C{H}_3|C{H}_{3}4)C\dot{H_3}$

1. 3 > 2 > 1 > 4

2. 3 > 2 > 4 > 1

3. 1 > 2 > 3 > 4

4. 3 > 4 > 1 > 2

Q.

What happens when:

Methane is mixed with steam and passed over the nickel.