The Aldol Addition

Q. How can we distinguish between
1) benzyl chloride and chloro benzene
2) chloroform and tetrachloride

Q.

Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. The compound F is:

1. 

2. 

3. 

4. 

Q.

How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate?

$2KCl{O}_3\to 2KCl+3O_2$

1. 3 mole

2. 6 mole

3. 9 mole

4. 12 mole

Q. An organic compound A $\left(C_4{H}_{6}Cl\right)$ on reaction with Na/diethyl ether gives a hydrocarbon, which on monochlorination gives only one chloro derivative. A is

1. n–butyl chloride
2. Isobutyl chloride
3. tert–butyl chloride
4. sec – butyl chloride

Q. Identify the major product formed in the following sequence of reactions:

Q. Butan-$2$-one can be converted to propanoic acid by which of the following ?

1. $NaOH,NaI/H^{+}$
2. Fehling’s solution
3. $NaOH/I_2,H^{+}$
4. Tollen’s reagent

Q.
How many $H$ atoms can be exchanged by deuterium when the shown compound is kept with $O{D}^{-}/D_{2}O$?

Q.

Give the laboratory preparation of ethyl alcohol

Q.

How will you convert ethanal into the following compounds ?

Butane - 1, 3 - diol

But - 2 - enal

But - 2 - enoic acid

Q. Phenol can be distinguished from alcohol by using

1. Tollens reagent
2. Schiff's base
3. Neutral $FeC{l}_3$
4. $HCl$

Q. In the given reaction,


The number of $\pi$ electrons present in the product ‘P’ is_____.

Q. Benzaldehyde undergoes aldol condensation in -

1. acid medium
2. alkaline medium
3. neutral medium
4. none of these

Q.

Give the balanced equation for the laboratory preparation of an alcohol from Ethyl bromide.

Q.

An organic compound C3H6O does not give a precipitate with 2, 4‑Dinitrophenyl hydrazine reagent and does not react with metallic sodium. It could be:

1. CH2=CH-CH2OH
2. CH3CH2CHO
3. CH2=CH-O-CH3
4. CH3COCH3

Q.

Write the balanced chemical equation for mixture of Soda-lime and Sodium acetate is heated

Q. 2, 3 - dibromobutane can be converted to 2 - butyne in a two -step reaction using

1. (i) HCI and (ii) NaH
2. (i) alcoholic KOH and (ii) $NaN{H}_2$
3. (i) Na and (ii) NaOH
4. (i) $B{r}_2$ and (ii) NaH
   
   

Q.

Wurtz reaction of certain alkyl halide 'X' yields an organic compound 3, 4 -

dimethyl hexane, then which of the following is an isomer of 'X'

a. n - butyl chloride b. Isobutyl chloride

c. Tertiary butyl chloride d. Sec butyl chloride

1. Only a, b & c

2. All of the above

3. Only a & b

4. Only b & d

Q. methylamine on treatment with nitrous acid gives: 1.methanol 2.methyl nitrite 3.dimethyl ether 4.both 2 and3

Q. The action of bromine water (excess) on salicylic acid results in the formation of

1. 
2. 
3. 
4. 

Q.
In the given reaction, end product is:

1. 
2. 
3. 
4. 

Q.

The equation for the burning of octane is:

$2{\mathrm{C}}_8{\mathrm{H}}_{18}+25{\mathrm{O}}_2\to 16{\mathrm{CO}}_2+18{\mathrm{H}}_2\mathrm{O}$

1. How many moles of carbon dioxide are produced when $1$mole of octane burns?
2. What volume, at STPs is occupied by the number of moles determined in (i)?
3. If the relative molecular mass of carbon dioxide is$44$, what is the mass of carbon dioxide produced by burning two moles of octane?
4. What is the empirical formula of octane?

Q. 1. FeSO4 is a very good absorber for NO, the new compound formed by this process is found to contain number of unpaired electrons: (A) 4 (B) 5 (C) 3 (D) 6

Q. Which of the following does not participate in Carbylamine reaction?

1. Aniline
2. Chloroform
3. Ethanal
4. $KOH$

Q. Aldehydes that do not undergo aldol condensation are:
(1) propanal
(2) trichloroethanal
(3) 2-phenylethanal
(4) ethanal
(5) benzaldehyde

1. $3$ and $4$ only
2. $2$ and $5$ only
3. $2,3$ and $5$ only
4. $1,2$ and $3$ only

Q. An organic compound having structure as given below:
How many of the below given reactions will it give?
1. Ceric ammonium nitrate test
II. Brisk effervescence with sodium bicarbonate
III. Characteristic colouration with neutral ferric chloride after decarboxylation and reduction by Clemmenson's method
IV. Fehling's test
V. Tollen's test
VI. Orange dye with benzene diazonium chloride
VII. Molisch test

Q. Find the product formed when cyclohexanone undergoes aldol condensation followed by heating.

1. 
2. 
3. 
4. 

Q.

Complete the following reactions with appropriate structures of products/reagents:

From the options, choose one that can replace the question marks in the above scheme.
Only major products can be considered.

1. Benzaldehyde made to react with cyclohexanone in the presents of a strong base

2. 

3. A is the final product; B gives the reagent/conditions/solvent for the first part.

4. Neither A nor B can sufficiently explain the reaction scheme

Q. In the reaction,
$C_6{H}_{5}CHO+(C{H}_{3}CO{)}_{2}O\underset{{180}^{\circ }C}{\overset{C{H}_{3}COONa}{\to }}X$, 'X' is

1. $C_6{H}_{5}COOH$
2. $C_6{H}_{5}C{H}_3$
3. $C_6{H}_{5}CH=CHCOOH$
4. $C_6{H}_{5}CO{C}_6{H}_5$

Q. 38 Which of the following reagents would not be a good choicefor reducing anaryl nitro compound to an amine? (1) H2(excess)/Pt (2) LiAlH4 in ether. (3) Fe and HCl (4) Sn and HCl

Q. Why do aldehydes get easily oxidised and ketones dont?