Alcohols, Phenols and Ethers
The graph which represents the following reaction is :
Identify the incorrect option from the following
Decreasing order of dehydration of the following alcohols is
An organic compound 'A' with emperical formula $\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}$ gives sooty flame on burning. Its reaction with bromine solution in low polarity solvent results in high yield of B. B is
A solution of $\mathrm{Cr O_5}$ in amyl alcohol has a __________ colour.
Find out the major product for the following reaction.
The increasing order of $\mathrm{pK_a}$ for the following phenols is
(A) 2, 4 - Dinitrophenol
(B) 4 - Nitrophenol
(C) 2, 4, 5 - Trimethylphenol
(D) Phenol
(E) 3-Chlorophenol
Choose the correct answer from the option given below :
Find out the major product from the following reaction.
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Butylated hydroxy anisole when added to butter increases its shelf life.
Reason R : Butylated hydroxy anisole is more reactive towards oxygen than food.
In the light of the above statements, choose the most appropriate answer from the options given below
In the cumene to phenol preparation in presence of air, the intermediate is
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Acetal / Ketal is stable in basic medium.
Reason R : The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium.
In the light of the above statements, choose the correct answer from the options given below :
'A' and 'B' formed in the following set of reactions are :
The number of hyperconjugation structures involved to stabilize carbocation formed in the above reaction is _________.
Explanation:
So, number of hyperconjugation structures in most stable carbocation
$=6+1=7$
The ratio x/y on completion of the above reaction is __________.
Explanation:
For completion of reaction, we need 2 moles of $\mathrm{MeMgBr}$ per mole of reactant
1 mole for nucleophilic addition and 1 mole for acid base reaction.
Among the following, the number of compounds which will give positive iodoform reaction is _________
(a) 1-Phenylbutan-2-one
(b) 2-Methylbutan-2-ol
(c) 3-Methylbutan-2-ol
(d) 1-Phenylethanol
(e) 3,3-dimethylbutan-2-one
(f) 1-Phenylpropan-2-ol
Explanation:
The denticity of the ligand present in the Fehling's reagent is ___________.
Explanation:
When ethanol is heated with conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$, a gas is produced. The compound formed, when this gas is treated with cold dilute aqueous solution of Baeyer's reagent, is
A compound 'X' is acidic and it is soluble in NaOH solution, but insoluble in NaHCO3 solution. Compound 'X' also gives violet colour with neutral FeCl3 solution. The compound 'X' is :
Compound I is heated with Conc. HI to give a hydroxy compound A which is further heated with Zn dust to give compound B. Identify A and B.
Choose the correct option for the following reactions.
Identify the major products A and B for the below given reaction sequence.
In the above reaction product B is :
Hydrolysis of which compound will give carbolic acid?
The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to :
Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide $(\mathrm{PhMgBr})$ followed by acidic hydrolysis?
The major product of the following reaction is
Most stable product of the following reaction is:
Given below are two statements :
Statement I : On heating with $\mathrm{KHSO}_{4}$, glycerol is dehydrated and acrolein is formed.
Statement II : Acrolein has fruity odour and can be used to test glycerol's presence.
Choose the correct option.
Consider the above reaction sequence. Identify the component A and component B :
Given below are two statements :
Statement I : Phenols are weakly acidic.
Statement II : Therefore they are freely soluble in NaOH solution and are weaker acids than alcohols and water.
Choose the most appropriate option :
The major product (P) of the given reaction is
(where, Me is $-$CH3)
Match List-I with List-II.
| List-I | List-II | ||
|---|---|---|---|
| (A) |  |
I. | $B{r_2}$ in $C{S_2}$ |
| (B) |  |
II. | $N{a_2}C{r_2}{O_7}/{H_2}S{O_4}$ |
| (C) |  |
III. | $Zn$ |
| (D) |  |
IV. | $CHC{l_3}/NaOH$ |
Choose the correct answer from the options given below :
Consider the above reaction sequence and identify the product B.
In the given reaction
'A' can be
The major product formed in the following reaction, is
The intermediate X, in the reaction :
In the following reaction :
The compounds A and B respectively are :
Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite gives 'B', which on further heating with soda lime gives 'C'. The compound 'C' is :
In the following reaction
The $\%$ yield for reaction I is $60 \%$ and that of reaction II is $50 \%$. The overall yield of the complete reaction is __________ $\%$. [nearest integer]
Explanation:
Let initial moles of reactant taken = n
Total moles obtained for benzene sulphonic acid (with % yield = 60%) = 0.6n
Moles of benzene sulphonic acid before reaction II = 0.6n
Moles obtained for phenol (with % yield = 50%) = 0.6 × 0.5n = 0.3n
So over all % yield of complete reaction $=\frac{0.3 \mathrm{n}}{\mathrm{n}} \times 100=30$
The number of chiral alcohol(s) with molecular formula C4H10O is ________.
Explanation:
Out of which only two are chiral
In the given reaction,
the number of sp2 hybridised carbon(s) in compound 'X' is ________.
Explanation:
Compound 'P' on nitration with dil. HNO3 yields two isomers (A) and (B). These isomers can be separated by steam distillation. Isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. HNO3 yields a yellow compound 'C', a strong acid. The number of oxygen atoms is present in compound 'C' _____________.
Explanation:
Assertion (A) : Treatment of bromine water with propene yields 1-bromopropan-2-ol.
Reason (R) : Attack of water on bromonium ion follows Markovnikov rule and results in 1-bromopropan-2-ol.
In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion (A) : Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis.
Reason (R) : Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether.
In the light of the above statements, choose the most appropriate answer from the options given below :
