Introduction to Alkanes

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. The correct IUPAC name of the alcohol $\left[\right(C{H}_3{)}_{2}CH{]}_{3}COH$ is

1. 2, 4 - dimethyl - 3 - (1 - methylethyl) pentan -3 ol

2. 2, 4 - dimethyl -3- isopopylpentan - 3 - ol

3. tri - isopropyl methanol

4. tri - isopropyl Carbinol

Q.

Generally Bond length of alkynes are lower than alkanes and alkanes - True or False?

1. False
2. True

Q. 8. We know when PCl5 undergoes hydrolysis it forms POCl3 which further hydrolys to give H3PO4. Then why PCl5 on reaction with D2O doesnt form D2PO4

Q.

Which of the following isomerism is shown by alkanes?

1. Tautomerism

2. Chain

3. Conformational

4. Functional

Q. 10.Degree of hydrolysis of 0.1 molar nh4cn is 5% . if it is 10 times diluted degree of hydrolysis becomes

Q. The compound which has one isopropyl group is (1) 2, 2, 3, 3 -Tetramethylpentane (2) 2, 2 -Dimethyl pentane (3) 2, 2, 3-Trimethylpentane (4) 2-Methyl pentane

Q.

Write the IUPAC name of the compound CH₃CH=CH-CH₂Br.

1. 2-Bromo-2-butene

2. 2-Bromo-1-butene

3. 1-Bromo-2-butene

4. Ethyl benzene

Q. 59 Which of the following undergoes hydrolysis at faster rate and why? 1) CH3-CHCl-CH3 2) CH3-CH(CH3)-CH2Cl

Q. 14. Why benzene has six carbon and six hydrogen? Explain it

Q. How to name tricyclic organic compounds?

Q. 63. how to calculate percentage composition for CH4

Q. hydrolysis of ch3cooNa increase when it is mixed with the solution of (1) ch3cooh (2) Naoh (3) hcl (4) Nh4o

Q.

IUPAC name of the following compound is $C{H}_3-CH=CH-C\equiv CH$

1. 5-Pentyn-3-ene

2. 3-Penten-1-yne

3. 1-Pentyn-3-ene

4. None of these

Q.

The compound which has one isopropyl group is:

1. 2, 2-dimethyl pentane

2. 2, 2, 3, 3-tetramethyl pentane

3. 2-methyl pentane

4. 2, 2, 3-trimethyl pentane

Q. How does hydrolysis of (Nh4)2SO4 take place?

Q. Commercial sources of alkanes include:

1. coal
2. natural gas
3. petroleum
4. all of the above

Q. 45. Determine formula of a compound formed by A and B atoms in which- A- corner B- alternate face centre.

Q.

In alkane the bond angle is

1. ${109.5}^{\circ }$

2. ${105}^{\circ }$

3. ${120}^{\circ }$

4. ${180}^{\circ }$

Q. 23. Amongst the following compounds the one which is most easily sulphonated is: 1. Benzene 2. Nitrobenzene 3. Toluene 4. Chlorobenzene

Q.

Number of chain isomers of $C_6{H}_{14}$ are:

1. 3

2. 4

3. 6

4. 5

Q. 5. Numbering and naming of the organic compound: I-CH2-CH2-CH2-Br.

Q. The main sources of organic compounds is/are:

1. Natural gas
2. Petroleum
3. Coal
4. All

Q.

Kerosene is used as a fuel because

1. it is less volatile

2. it is more volatile

3. it is cheap

4. it is abundantly available

Q.

Number of $\sigma s{p}^2-s{p}^2$ bonds pre3sent in a molecule of x in the process $C_6{H}_6\stackrel{H_2/Ni}{\to }X$ is

1. 6

2. 3

3. 12

4. Zero

Q. We know that in keto enol tautomerism keto form is most commonly most stable than enol form. Similarly in nitro acinitro tautomerism which form is, in general, more stable?(nitro or anitro?)

Q. The major product in the following reaction is $Ph-Cl+B{r}_2\stackrel{\text{Anhydrous}FeB{r}_3}{\to }$ Product

1. o-bromochlorobenzene
2. m-bromochlorobenzene
3. 2, 4, 6-tribromochloro benzene
4. p-bromochlorobenzene

Q. An organic compound on analysis gave the following data :C = 57.82%, H = 3.6%, and 38.58% is oxygen. Find its emperical formula .

Q. The compound which has one isopropyl group is (1) 2, 2, 3, 3 -Tetramethylpentane (2) 2, 2 -Dimethyl pentane (3) 2, 2, 3-Trimethylpentane (4) 2-Methyl pentane

Q.

LPG is a mixture of

1. $C_6{H}_{12}+C_6{H}_6$

2. $C_4{H}_{10}+C_3{H}_8$

3. $C_2{H}_4+C_2{H}_2$

4. $C_2{H}_4+C{H}_4$