Organic Compounds

Q. 0.0833 mol of a carbohydrate of empirical formula $C{H}_{2}O$ contain $1\text{g}$ of hydrogen. The molecular formula of the carbohydrate is:

1. $C_5{H}_{10}{O}_5$
2. $C_6{H}_{12}{O}_6$
3. $C_{12}{H}_{12}{O}_{11}$
4. $C_3{H}_4{O}_3$

Q. Among the following compounds, the strongest acid is

1. $HC\equiv CH$
2. $N{H}_3$
3. $C{H}_2=C{H}_2$
4. $C{H}_{3}OH$

Q.

Why are double bonds shorter?

Q.

Which of the following are organic compounds?

1. $C{H}_{3}COOH$

2. $C_2{H}_{5}OH$

3. $HN{O}_3$

4. $C_2{H}_4$

Q.

Which of the following compounds can form a zwitter ion?

1. Benzoic acid

2. Acetanilide

3. Aniline

4. Glycine

Q. $\stackrel{\ominus }{C}{H}_3,\stackrel{\ominus }{N}{H}_2,O{H}^{\ominus },F^{\ominus }$ in increasing $p{K}_b$ values

1. $\stackrel{\ominus }{C}{H}_3,<\stackrel{\ominus }{N}{H}_2<O{H}^{\ominus }<F^{\ominus }$
2. $F^{\ominus }<O{H}^{\ominus }<\stackrel{\ominus }{N}{H}_2<\stackrel{\ominus }{C}{H}_3$
3. $O{H}^{\ominus }<\stackrel{\ominus }{N}{H}_2<\stackrel{\ominus }{C}{H}_3<F^{\ominus }$
4. none is correct

Q. Stability of conjugate base can be explained by

1. Hyperconjugation
2. Resonance
3. Inductive effect
4. All of the above

Q. The correct structural formula of 1, 2-Diethyl-1, 8-dimethyl-5- propylcyclooctane is :

1. 
2. 
3. 
4. 

Q. Arrange the following compounds in decreasing order of basicity.

1. $A>C>B>D$
2. $D>C>B>A$
3. .$D>C>A>B$
4. .$A>C>D>B$

Q. How acidic strength of an acid is related to its conjugate base?

1. Weaker the conjugate base means stronger the acid
2. Stronger the conjugate base means stronger the acid
3. Weaker the conjugate base means weaker the acid
4. None of the above

Q.

What is the basic difference between the terms electron Gain Enthalpy and electronegativity?

Q.

Which of the given statement(s) about N, O, P and Q with respect to M is (are) correct?

1. M and N are non-mirror image stereoisomers

2. M and O are identical

3. M and P are enantiomers

4. M and Q are identical

Q. Basic strength increases as

1. -R effect increases
2. -I effect increases
3. +R effect increases
4. None of the above

Q. How many $s{p}^3$ hybridised carbon atoms are there in the given anti cancer compound (podophyllotoxin) ?

1. 6
2. 7
3. 9
4. 8

Q. Arrange the following compounds in the increasing order of polarity.

1. $I<II<III$
2. $III<II<I$
3. $II<I<III$
4. $III<I<II$

Q. Arrange the following compounds in the increasing order of polarity.

1. $I<II<III$
2. $III<II<I$
3. $II<I<III$
4. $III<I<II$

Q. In the compound, $\stackrel{6}{C}{H}_2=\stackrel{5}{C}H-\stackrel{4}{C}{H}_2-\stackrel{3}{C}{H}_2-\stackrel{2}{C}H\equiv \stackrel{1}{C}{H}_2$, $C_2-C_3$ bond is of :

1. $sp-s{p}^2$
2. $sp-s{p}^3$
3. $s{p}^3-s{p}^3$
4. $s{p}^2-s{p}^3$

Q. Arrange the following in increasing order of their basic strength.
$C{H}_{3}CO{O}^{\ominus },FC{H}_{2}CO{O}^{\ominus },ClC{H}_{2}CO{O}^{\ominus },BrC{H}_{2}CO{O}^{\ominus }$

1. $FC{H}_{2}CO{O}^{\ominus }>ClC{H}_{2}CO{O}^{\ominus }>BrC{H}_{2}CO{O}^{\ominus }>C{H}_{3}CO{O}^{\ominus }$
2. $BrC{H}_{2}CO{O}^{\ominus }>ClC{H}_{2}CO{O}^{\ominus }>FC{H}_{2}CO{O}^{\ominus }>C{H}_{3}CO{O}^{\ominus }$
3. $ClC{H}_{2}CO{O}^{\ominus }>FC{H}_{2}CO{O}^{\ominus }>BrC{H}_{2}CO{O}^{\ominus }>C{H}_{3}CO{O}^{\ominus }$
4. $FC{H}_{2}CO{O}^{\ominus }<ClC{H}_{2}CO{O}^{\ominus }<BrC{H}_{2}CO{O}^{\ominus }<C{H}_{3}CO{O}^{\ominus }$

Q.

Keto-enol tautomerism is observed in

1. 

2. 

3. 

4. 

Q. Which one of the following acid are found in Red Ant ?

1. Formic acid
2. Acetic acid
3. None of the above
4. Propanoic acid

Q. In Carius method of estimation of halogens, 250 $mg$ of an organic compound gave 141 $mg$ of $AgBr$. The percentage of bromine in the compound is:
(Atomic mass of $Ag$= 108, Br= 80)

1. 24
2. 36
3. 48
4. 60

Q. Which of the following represent molecules represents the order of hybridisation $s{p}^3,s{p}^2,s{p}^2,s{p}^3,s{p}^2,s{p}^2,sp,andsp$ ?

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

Q. $(C{H}_3{)}_{3}CC{H}_{2}COOH$ is more acidic than $(C{H}_3{)}_{3}SiC{H}_{2}COOH$ because

1. Size of Si is more than that of carbon
2. Electronegativity of carbon is less than that of silicon
3. Silicon is more electropositive than carbon due to which $(C{H}_3{)}_{3}SiC{H}_{2}CO{O}^{-}$ becomes less stable
4. None of the above

Q. Arrange in decreasing order of basicity:

1. 1>3>4>2
2. 4>3>2>1
3. 1>2>3>4
4. 4>1>3>2

Q. In the compound, $\stackrel{6}{C}{H}_2=\stackrel{5}{C}H-\stackrel{4}{C}{H}_2-\stackrel{3}{C}{H}_2-\stackrel{2}{C}\equiv \stackrel{1}{C}H$, $C_2-C_3$ bond is of :

1. $sp-s{p}^2$
2. $sp-s{p}^3$
3. $s{p}^2-s{p}^3$
4. $s{p}^3-s{p}^3$

Q. The ratio of $\sigma$ and $\pi$ bonds in mesitylene is:

1. $3$
2. $5$
3. $6$
4. $7$

Q. Compare the acidic strength of the following compounds

1. A>B
2. A<B
3. A=B
4. None of the above

Q. The sodium test, or Lassaigne’s test, is used in an elemental analysis of the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, sulphur and phosphorus in an organic compound.
The test involves heating the sample strongly with a clean sodium metal, ‘fusing’ it with the sample. The ‘fused’ sample is then plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents.
Which of the following compounds will give negative Lassaigne’s test for nitrogen?

1. 
2. 
3. 
4. 

Q. The sodium test, or Lassaigne’s test, is used in an elemental analysis of the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, sulphur and phosphorus in an organic compound.
The test involves heating the sample strongly with a clean sodium metal, ‘fusing’ it with the sample. The ‘fused’ sample is then plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents.

When both $N$ and $S$ are present in an organic compound, the sodium extract with $FeC{l}_3$ gives a:

1. Green colour
2. Blue colour
3. Yellow colour
4. Red colour

Q. Among the following, the number of aromatic compounds is: