Locant

Q.

How to name organic compounds using IUPAC NOMENCLATURE

Q.

Give the IUPAC names of ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Br}$

Q.

Compare the relative stability of the following species and indicate their magnetic properties;

O₂, , (superoxide), (peroxide)

Q. Write structures and IUPAC names of different structural isomers of alkenes corresponding to $C_5{H}_{10}$

Q.

Write all the geometrical isomers of [Pt(NH₃)(Br)(Cl)(py)] and how many of these will exhibit optical isomers?

Q.

The general formula ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}$ represents ___.

Q. According to the Cahn-Ingold-Prelog system, we assign priorities (1, 2, 3, or 4) to the atoms directly bonded to the stereogenic center in order of decreasing atomic number. The atom of highest atomic number gets the highest priority (1). Suppose, there is a tie - as would be the case with the chiral center of 2-Butanol - where two different groups - methyl and ethyl are attached to the chiral carbon. So there is a tie between the Carbons of each groups. In that case, how is the tie resolved?

1. We assign a higher priority to whichever group is heavier
2. We assign a higher priority to the more reactive group
3. We assign priority based on the atomic number of the atoms bonded to these atoms (which are tied). One atom of higher atomic number determines a higher priority.
4. None of the above

Q. What do you mean by a locant?

1. Locant is the number of functional groups in the longest chain of a molecule
2. Locant is the number used to indicate the position of a functional group in a molecule
3. Locant is the sum of all the numbers of the functional groups in a molecule
4. Locants are the numbers that we assign to the carbon atoms.

Q. When two halogen atoms are attached to adjacent carbon atom then it is

1. vicinal dihalide
2. geminal dihalide
3. poly haloalkane
4. None of the above

Q.

Which of the following is the correct IUPAC name?

1. $4,4-\text{Bis(methyl)}-3-\text{ethylheptane}$

2. $3-\text{Ethyl}-4,4-\text{dimethylheptane}$

3. $5-\text{Ethyl}-4,4-\text{dimethylheptane}$

4. $3-\text{Ethyl}-4,4-\text{dimethylheptane}$

Q.

Write the IUPAC name of each of the following:

$\mathrm{HCHO}$

Q. Consider the following pairs of structures. Identify the relationship between them by describing them as representing enantiomers, diastereomers, consitutional isomers, or two molecules of the same compound.

1. Enantiomer
2. Diastereomer
3. Meso compound
4. Consititutional isomer

Q.

What is the structure and $IUPAC$ name of the compound, allyl amine?

Q. What do you mean by a locant?

1. Locants are the numbers that we assign to the carbon atoms.
2. Locant is the number used to indicate the position of a functional group in a molecule
3. Locant is the number of functional groups in the longest chain of a molecule
4. Locant is the sum of all the numbers of the functional groups in a molecule

Q.

Write the IUPAC name of each of the following:

${\mathrm{CH}}_3\mathrm{CHO}$

Q.

Write a short note on functional group isomerism.

Q. Number of 1°, 2° and 3° hydrogens in isooctane is:

1. 9, 8, 1
2. 12, 5, 1
3. 15, 2, 1
4. None of these

Q.

Compare the relative stability of the following species and indicate their magnetic properties;

O₂, , (superoxide), (peroxide)

Q. Name the linkage connecting monosaccharide units in polysaccharides.

Q. Iso-octane contains :

1. 5 primary, one secondary and two tertiary carbon atoms.
2. 4 primary, two secondary and one tertiary carbon atoms.
3. Five $1^0$ Carbon, one $2^0$ Carbon, one $3^0$ Carbon and one $4^0$ Carbon atoms.
4. Five $1^0$ Carbon, two $2^0$ Carbon, one $3^0$ Carbon and one $4^0$ Carbon atoms.

Q. The CN and ON of X in the compound [X(SO4)(NH3)5] will be- (1) 10 and 3 (2) 1 and 6 (3) 6 and 4 (4) 6 and 2

Q. $IUPAC$ name of the compound is ____________.

1. $2-$methoxy$-2-$methylethane
2. $2-$methoxypropane
3. isopropylmethyl ether
4. $1-$methoxy$-1-$methylethane

Q.

Give the units of ${\mathrm{K}}_{\mathrm{C}}$ for the formation of 1 mole of ${\mathrm{NH}}_3$ from its constituents.

Q.

Write the \(IUPAC\) name of

Q.

Write the molecular formula of each of the following compound whose:

(a) empirical formula$={\mathrm{C}}_2{\mathrm{H}}_4\mathrm{O}$, molecular weight$=132$

Q.
The correct statement(s) concerning the structures $\text{E, F}$ and $\text{G}$ is/are:

1. $\text{E, F and G are resonance structures}$
2. $\text{(E, F) and (E, G) are tautomers}$
3. $\text{F and G are geometrical isomers}$
4. $\text{F and G are diastereomers}$

Q. Which of the following groups has the highest priority according to the Cahn-Ingold-Prelog sequence rules?

1. $C{H}_{2}Cl$
2. $C{H}_{2}OH$
3. $C{H}_3$
4. $CHO$

Q. What are the locants in the following molecule?

1. 1, 2, 3, 3
2. 2, 3, 4, 4
3. 1, 2, 3, 4
4. 1, 2,

Q. Maximum covalenxy of 3A group

Q.

The priority sequence of the following substituent according to E-Z system of nomenclature is?

-C≡CH; -C (CH₃)₃; -CH= CH₂; -CH(CH₃)₂

I II III IV

1. II>III>I>IV

2. IV>III>II>I

3. I>II>III>IV

4. IV>I>III>II