Representations of Organic Compounds

Q. Wedge and dash projection of a molecule represents the of the compound.

1. 3D geometry
2. 2D geometry
3. Stability
4. Reactivity

Q. 30. A gaseous alkane is explodes with oxygen the mole of O2 for complete combustion and CO2 formed is in the ratio 7:4 deduce the molecular formula of alkane

Q.

In the presence of $AlC{l}_3$/HCl n-butane isomerizes to:

1. Isobutane

2. 2-Butene

3. Isobutene

4. 1-Butene

Q. 3. Explain the mechanism of Allylic substitution in alkenes using NBS (N Bromo Succinimide)

Q. What will be the volume of 1 mole atom of hydrogen?

Q. Why is alkene a better nucleophile than alkyne or more reactive towards electrophilic addition than alkyne?

Q.

Draw the structural formula of a compound with two carbon atoms in case of:

An alcohol containing two carbon atoms.

Q. How to name esters and ethers according to IUPAC nomenclature?

Q. 5. The number of isomeric alkenes possible for C5H10 are

Q.

Write structural formulae for compounds named as:

$A)$ $1-\text{Bromoheptane}$

Write structural formulae for compounds named as:

$B)$ $5-\text{Bromoheptanoic acid}$

Q. 45 All the given species undergo dimer formation. Find out the number of species for which dimerisation does NOT require vacant orbital. AlCl3, BH3, ClO3, ICl3, NO2, BeCl2. (All numbers are in subscript)

Q.

The polymer used as electrodes in batteries is

1. polythene

2. polypropene

3. polyacetylene

4. poly vinyl chloride

Q. write different structural isomers of alkene corresponding to C5H10

Q. How many different isomeric alkenes are possible for C5H10?

Q. In hcp lattice, if a plane is drawn parallel to layers A and B, at a distance c/8 above the layer B, it passesthrough centres of x tetrahedral and y octahedral voids. A plane parallel to layer A, at a distance c/8 justbelow it passes through centres of p tetrahedral and q octahedral voids. Find (x + y + p+q). c is the cellparameter of hcp lattice, the vertical edge length. (A) 10(B) 9(C) 6(D) 14

Q.

The chain isomer of butane is:

1. 

2. 

3. 

4. None of these.

Q. The condensed formula of propane is .

1. $C{H}_{3}CH\left(C{H}_3\right)C{H}_3$
2. $C{H}_{3}C{H}_{2}C{H}_3$
3. $C{H}_{3}C{H}_3$

Q. when ethene is catalytically hydrogenated then ethane does not form. WHY??

Q. Write bond line formula for:

Q. Number of nodal planes in sigma star 2Pz ( σ * ) Molecular orbital

Q.

Number of chain isomer of $C_5{H}_{12}$ is :

1. 5

2. 3

3. 8

4. 2

Q.

While denoting an organic compound in the form , which type of representation is used?

1. Swastika line form

2. Wedge and dash form

3. condensed form

4. Bond line form

Q. 1. IUPAC name of vinyl acetylene is (a) but-1-ene-3-yne (b) but-1-yne-3-ene (c) both are correct (d) None of the above

Q. 69 What is the structural formula of -- isopropyl alcohol.

Q. The number of sigma ($\sigma$) and pi ($\pi$) bonds in pent-2-en-4-yne is:

1. 10$\sigma$ bonds and 3$\pi$ bonds
2. 8$\sigma$ bonds and 5$\pi$ bonds
3. 11$\sigma$ bonds and 2$\pi$ bonds
4. 13$\sigma$ bonds and no $\pi$ bonds

Q. Draw Lewis dot structure of HNO3 and mention Co-ordinate bond wherever required.

Q. 20 In NaCl there are how many Schottky pairs per cm3 at R.T

Q.

An unknown compound ( A) has a molecular formula C₄ H₆. When (A) is treated with excess of Br₂ a new substance (B) with formula C₄H₆ Br₄ is formed. (A) forms a white ppt. with ammoniacal silver nitrate. Compound A is

1. (a)But-1-yne

2. (a)But-2-yne

3. (a)But-1-ene

4. (a)But-2-ene

Q. Indicate the $\sigma$ and $\pi$ bonds in the following molecules.
$C_6{H}_6,C_6{H}_{12},C{H}_{2}C{l}_2,C{H}_2=C=C{H}_2,C{H}_{3}N{O}_2,HCONHC{H}_3$

Q. Which of the following is correct bond line representation for the given expanded formula?

1. 
2. 
3. 
4. None of the above