CBSE Questions for Class 12 Medical Chemistry Alcohols, Phenols And Ethers Quiz 10 - MCQExams.com

Dehydration of 2-butanol yields
  • 1-butene
  • 2-butene
  • 2-butyne
  • both (A) and (B)
Which of the following alcohol does not give a stable compound on dehydration?
  • Ethyl alcohol
  • Methyl alcohol
  • n-propyl alcohol
  • n-butyl alcohol
Which of the following would undergo dehydration most readily?
  • 1-phenyl-1butanol
  • 2-phenyl-2-butanol
  • 1-phenyl-2-butanol
  • 2-phenyl-1-butanol
Which compound is soluble in water
  • $$ CS_2 $$
  • $$ C_2H_5OH $$
  • $$ CCl_4 $$
  • $$ CHCl_3 $$
Which of the following reagents convert the propene to 1-propanol
  • $$ H_2O, H_2SO_4 $$
  • Aqueous KOH
  • $$ MhSO_4 , NaBH_4/ H_2 O $$
  • $$ B_2H_6, H_2O_2,OH^- $$
The order of melting point of ortho, para, meta-nitrophenol is:
  • $$ o > m > p $$
  • $$ p > m > o $$
  • $$ m > p > o $$
  • $$ p > o > m $$
The product $$(B)$$ is:
1770549_ff3cf45b4e03435baca7532caa13781e.png
  • All
The major product of (B) is:
Which compound is soluble in $$ H_2O $$ 
  • $$ HCHO $$
  • $$ CH_3CHO $$
  • $$ CH_3COCH_3 $$
  • All
Heating ethanol at 443 K with excess concentrated sulphuric acid results in the dehydration of ethanol to give ethane
  • True
  • False
The keto form of phenol contains
  • 3 $$\pi$$,12 $$\delta$$ 4 non-bonding electrons
  • 3 $$\pi$$,9 $$\delta$$ 4 non-bonding electrons
  • 3 $$\pi$$,9$$\delta$$ 2 non-bonding electrons
  • 3 $$\pi$$,8 $$\delta$$ 4 non-bonding electrons
Identify $$Z$$ in the following series:
$$C_2H_5OH \xrightarrow[]{PBr_3} X \xrightarrow[]{alc. \,KOH} \xrightarrow[(ii) H_2O + \text{heat}]{(i) H_2SO_4} Z$$
  • $$CH_2 = CH_2$$
  • $$CH_3 - CH_2OH$$
  • $$CH_3 - CH_2 - O - CH_2 - CH_3$$
  • None
IUPAC name of the compound is:

$$CH_{3} - \underset{CH_{2} CH_{3} \!\!\!\!\!\!\!} {\underset{|}{C}H} - CH_{2} - CHOH - CH_{3} $$ is 
  • $$4$$-Methyl-$$3$$-hexanol
  • Heptanol
  • $$4$$-Methyl-$$2$$-hexanol
  • None of these
Which of the following compound has wrong IUPAC name ?
  • $$CH_{3} - CH_{2} - CH_{2} - COO - CH_{2} CH_{2} $$ ethyl butanoate
  • $$CH_{3} - \underset{CH_3}{\underset{|} {C}H} - CH_{2} - CHO $$ $$3$$-methylbutanal
  • $$CH_{3} - \underset{OH} {\underset{|} {C}H} - \underset{CH_3}{\underset{|} {C}H} - CH_{3} $$ $$2$$-methyl-$$3$$-butanol
  • $$CH_{3} - \underset{CH_3}{\underset{|} {C}H} - \underset{O}{\underset{\parallel} {C}} - CH_{2} - CH_{3} $$ $$2$$-methyl-$$3$$-pentanone
Statement-1: In the fermentation process of molasses, along with yeast, $$(NH_{4})_{2}SO_{4}$$  and $$(NH_{4})_{3}PO_{4}$$ are added.
Statement-2: Both $$(NH_{4})_{3}PO_{4}$$ and $$(NH_{4})_{2}SO_{4}$$ act as food and help in the growth of yeast.
  • Statement-1 is True, statement-2 is True; statement-2 is a correct explanation for statement-1
  • Statement-1 is True, statement-2 is True; statement-2 is NOT a correct explanation for statement-1
  • Statement-1 is True, statement-2 is False
  • Statement-1 is False, statement-2 is True
Teritary alcohol is obtained as major product in
  • $$(CH_{3})_{2}CH-CH=CH_{2}\overset{oxymercution/demercution}{\rightarrow}$$
  • $$(CH_{3})_{3}C-CH=CH_{2}\overset{dilH_{2}SO_{4}}{\rightarrow}$$
  • $$(CH_{3})_{2}CH-CH=CH_{2}\overset{Hydroboration,Oxidation}{\rightarrow}$$
  • All of the above
Which reagent can be used to convert ethanol to diethyl ether?
  • $$Al_{2}O_{3}$$ at $$250^{0}C$$
  • conc. $$H_{2}SO_{4}$$ at $$170^{0}C$$
  • conc. $$H_{2}SO_{4}$$ at $$130^{0}-140^0C$$
  • $$Al_{2}O_{3}$$ at $$350^{0}C$$
Hydrogen chloride and $$SO_{2}$$ are the side products in the reaction of ethanol with thionyl chloride. Which of the following is main product in this reaction?
  • $$C_{2}H_{5}-O-C_{2}H_{5}$$
  • $$C_{2}H_{6}$$
  • $$CH_{3}Cl$$
  • $$C_{2}H_{5}Cl$$
Which of the following substance can be used as a raw material for obtaining alcohol?
  • Potatoes
  • Molasses
  • Maize
  • All of the above
Which of the following catalyst is used in the conversion of water gas and hydrogen into methyl alcohol?
  • $$MnO$$
  • Raney $$Ni$$
  • $$Fe$$
  • $$ZnO-Cr_{2}O_{3}$$
Oxymercuration-demercuration reaction $$(Hg(OAc)_{2}/THF-H_{2}O)$$ followed by $$(NaBH_{4}, C_{2}H_{5}OH)$$ on $$CH_{3}CH=CH_{2}$$ produces:
  • $$CH_{3}CH_{2}CH_{2}CO$$
  • $$CH_{3}CH(OH)CH_{3}$$
  • $$CH_{3}CH(OH)CH_{2}OH$$
  • $$CH_{3}COCH_{3}$$
Hydroboration-oxidation of $$CH_{3}CH= CH_{2}$$ produces:
  • $$CH_{3}CH_{2}CH_{2}OH$$
  • $$CH_{3}CH(OH)CH_{3}$$
  • $$CH_{3}CH(OH)CH_{2}OH$$
  • $$CH_{3}COCH_{3}$$
An industrial method of preparation of methanol is:
  • catalytic reduction of carbon monoxide in presence of $$ZnO-Cr_{2}O_{3}$$
  • by reacting methane with steam at $$900^{0}C$$ with a nickel catalyst
  • by reducing formaldehyde with lithium aluminium hydride
  • by reacting formaldehyde with aqueous sodium hydroxide solution
In which one of the following reagents $$O-H$$ bond fission in alcohol can not take place?
  • Na
  • $$CH_{3}COOH$$
  • $$CH_{3}MgBr$$
  • $$PCl_{5}$$
Which of the following reactions are correctly represented?
Which of the following pairs of reagents will not form ether?
  • $$C_{2}H_{5}Br+C_{2}H_{5}ONa$$
  • $$C_{2}H_{5}Br+CH_{3}ONa$$
  • $$CH_{3}Br+C_{2}H_{5}ONa$$
  • $$C_{2}H_{5}Br+HCOONa$$
Compounds formed from P and Q are, respectively:
42154.PNG
  • Optically active S and optically active pair (T, U)
  • Optically inactive S and optically inactive pair (T, U)
  • Optically active pair (T, U) and optically active S
  • Optically inactive pair (T, U) and optically inactive S
$$(CO+H_{2})+H_{2}\overset {673k,300atm,/Cr_{2}O_{3}-ZnO} {\rightarrow}$$ 
The above shown reaction may by used for manufacture of:
  • $$HCHO$$
  • $$CH_{3}COOH$$
  • $$HCOOH$$
  • $$CH_{3}OH$$
2- phenyl propene on acidic hydration gives :
  • 2-phenyl-2-propanol
  • 2-phenyl-1-propanol
  • 3-phenyl-1-propanol
  • 1-phenyl-2-propanol
$$CH_{3}MgX\overset{CH_{3}COOC_{2}H_{5}}{\rightarrow} A \overset{Na} {\rightarrow} B \overset{C_{2}H_{5}Br}{\rightarrow} C$$
Here, C is :
  • $$C_{2}H_{5}OC_{2}H_{5}$$
  • $$CH_{3}COOC_{2}H_{5}$$
  • $$CH_{3}COOCH_{3}$$
  • $$(CH_{3})_{3}COC_{2}H_{5}$$
How many structures of F are possible?

42989_afaceb628c234d94b62e6bd5caf2d65a.png
  • $$2$$
  • $$5$$
  • $$6$$
  • $$3$$
An organic compound (A) containing C, H and O has a pleasant odour with boiling point $$78^{0}$$. On boiling (A) with concentrated $$H_{2}SO_{4}$$, colourless gas is evolved which decolorizes bromine water and alkaline $$K MnO_{4}$$. The organic compound (A) is :
  • $$C_{2}H_{5}Cl$$
  • $$C_{2}H_{5}COOCH_{3}$$
  • $$C_{2}H_{5}OH$$
  • $$C_{2}H_{6}$$

The structure of compound $$I$$ is:

32372_60352c7742c341b8876aeb5c3e9f47cc.png
Ortho-nitrophenol is less soluble in water than para and meta-nitrophenols because:
  • o- nitrophenol is more volatile in steam than those of m- and p- isomers.
  • o- nitrophenol shows intramolecular $$H-$$bonding.
  • o-nitrophenol shows intermolecular $$H-$$bonding.
  • none of these.
Identify the structure of A:
  • $$CH_3 - CH_2 - CH_2 - \underset{\!\!\!OH}{\underset{\!\!\!\!\!\!|}{CH}} - CH_3$$
  • $$(CH_3)_2CHCHOHCH_3$$
  • $$(CH_3)_3C-CH_2-OH$$
  • $$CH_3 - CH_2 - \underset{\!\!\!OH}{\underset{\!\!\!\!\!|}{CH}} - CH_2 - CH_3$$
On oxymercuration-demercuration, the given compound produces the major product:
99826.jpg

The main product of the above reaction is:
78493_e0316cdf09d04d38977eb712f7075c94.PNG
Which of the following will be the correct product (P) for the given reaction?
117502_50f9149ed1b14776b738c252fd421d18.png

The addition of mercuric acetate in the presence of water is called oxymercuration. The adduct obtained gives alcohol on reduction with $$NaBH_4$$ in alkaline medium. This is known as demercuration. Oxymercuration-demercuration allows Markownikoff's addition of H, OH without rearrangement. The net result is the addition of $$H_2O$$. 
Based on the above information, find product A in the given reaction.

117531_d9ead791051544a3868b5076e0b73290.png
Identify the correct option(s) related with the physical properties of the unknown compounds [X] and [Y] formed as major and minor product respectively in the given reaction.

72221.jpg
  • Water solubility of [Y] is greater than [X]
  • Boiling point of [Y] is greater than [X]
  • Melting point of [Y] is greater than [X]
  • [X] is more volatile than [Y]
$$Propan-1-ol$$ can be prepared from propene by :
  • $$H_2O / H_2SO_4$$
  • $$Conc. H_2SO_4$$
  • $$B_2H_6$$ followed by $$H_2O_2/OH$$
  • $$CH_3CO_2H / H_2SO_4$$
Which of the following reagents should be used to prepare tert-butyl ethyl ether?
  • $$tert$$-butyl bromide and sodium ethoxide
  • $$tert$$-butyl alcohol and ethyl bromide
  • $$tert$$-butyl alcohol and ethanol
  • potassium $$tert$$-butoxide and ethyl bromide
Ethanol $$\xrightarrow{PBr_3}X\xrightarrow{alc.KOH}Y\xrightarrow[(ii)H_2O,Heat]{(i)\;H_2SO_4\;room\;temperature}Z$$;
The product $$ Z$$ in the above reaction is:
  • $$CH_3CH_2\!-\!OH$$
  • $$CH_2 = CH_2$$
  • $$CH_3CH_2\!-\!O\!-\!CH_2CH_3$$
  • $$CH_3CH_2\!-\!O\!-\!SO_3H$$
$$A\:(C_7H_8O)+Na/\Delta\longrightarrow$$ No gaseous product
$$A+Br_2/FeBr_3\longrightarrow\:C_7H_7OB_r$$ (Two isomers) 
$$A$$ can be:
 $$C(CH_3)_2=C(CH_3)_2\xrightarrow[H_2O]{Cl_2} A\xrightarrow[]{OH^-} B$$
The compound $$B$$ is:
  • $$(CH_3)_2\underset{OH}{\underset{|}{C}-} \underset{Cl}{\underset{|}{C}} (CH_3)_2$$
  • $$(CH_3)_2\underset{OH}{\underset{|}{C}-} \!\!\underset{\,\,OH}{\underset{|}{C}} \!\!(CH_3)_2$$
  • none of the above
The compound $$A$$ and $$B$$ are :
124157_bbee0e1877a24525bf8b0572e7448693.png
  • None of the above
Which of the following are possible products in the above reaction?
137127_901b502cf66348ac801a42f9a1ef3bc9.png

Give the expected major product of the above reaction.

122697_a9edf726838e49c7a5c020ffbcaf5e04.png
Which method is useful for the synthesis of ether?
Which of the followings is/are true regarding phenol?
  • It turns pink when exposed to air
  • It is less reactive than anisole in aromatic electrophilic substitution reaction
  • It is more reactive than aniline in an aromatic electrophilic substitution reaction
  • Acetylation of phenol decreases its reactivity in aromatic electrophilic substitution reaction
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