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751.

Which one of the following will most readily be dehydrated in acidic condition?A. B. C. D.

Answer» Correct Answer - A
752.

Which fo the following would undergo dehydration most readily?A. `1`-pheny`1-1`butanolB. `2-`pheny`1-2`-butanolC. `1-`pheny`1-2`butanolD. `2-`pheny`1-1-`butanol

Answer» Correct Answer - B
More stable carbo `o+`
753.

Sodium metal reacts readily withA. R-CHOB. `R-CH_2OH`C. esterD. `R-NH_2`

Answer» Correct Answer - B
754.

The first product of oxidation of primary alcohol isA. carboxylic acidB. ketoneC. esterD. aldehyde

Answer» Correct Answer - D
755.

Which is a primary alcohol ?A. Butan-2-olB. Butan-1-olC. Propan-2-olD. Isopropyl alcohol

Answer» Correct Answer - B
756.

Butane - 2 - ol isA. primary alcoholB. secondary alcoholC. tertiary alcoholD. aldehyde

Answer» Correct Answer - B
757.

Allylic allohols may beA. `1^@` typesB. `2^@` typesC. `3^@` typesD. `1^@`, `2^@`, `3^@` types

Answer» Correct Answer - D
758.

Which of the following is allylic alcoholA. B. C. D.

Answer» Correct Answer - B
759.

In allylic alcohol - OH group is attached toA. sp - hybridised carbon atomB. `sp^2` - hybridised carbon atomC. `sp^3` - hybridised carbon atomD. `sp^3`-d-hybridised carbon atom

Answer» Correct Answer - C
760.

Alcohols gives alkyl halides, treatment withA. `PX_3`B. `PX_5`C. HXD. all of these

Answer» Correct Answer - D
`3ROH + PX_3 overset(Delta)to 3RX + H_3PO_3`
`ROH + PX_5 overset(Delta)to RX + POX_3 + HX`
`ROH + HX overset(Delta)to RX + H_2O`
761.

Assertion (A) Boiling points of alcohols and ethers are high. Reason (R) They can form intermolecular hydrogen-bonding.A. Assertion and reason both are correct and reason is correct explanation of assertion.B. Assertion and reason both are wrong statements.C. Assertion is correct statement but reason is wrong statement.D. Assertion is wrong statement but reason is correct statement.

Answer» Correct Answer - B
Assertion and reason both are wrong statements.
Correct Assertion Boiling points of alcohols are higher than that of ethers of comparable molecular mass.
Correct reason Alcohols can form intermolecular hydrogen bonding while ethers cannot.
762.

Classify the following as primary, secondary and tertiary alcohols: (i) `CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")(C )-CH_(2)OH` (ii) `H_(2)C=CH-CH_(2)OH` (iii) `CH_(3)-CH_(2)-CH_(2)-OH` (iv)

Answer» `{:("Primary alcohols","(i),(ii),(iii)"),("Secondary alcohols","(iv) and (v)"),("Tertialy alcohols","(vi)"):}`
763.

(A) The acidity of alcohols follows the order `1^(@) gt 2^(@) gt 3^(@)`. (R ) The `+I` effect of alkyl groups `(3^(@) gt 2^(@) gt 1^(@))` favours the dissociation of `-O-H` group.A. If both (A) and (R ) are correct and (R ) is correct explanation of (A ).B. If both (A ) and (R ) are correct but (R ) is not correct explanation of (A ).C. If (A) is correct but (R ) is incorrectD. If (A) is incorrect but (R ) is correct.

Answer» Correct Answer - C
764.

Ethers and alcohols areA. metamersB. functional isomersC. tautomersD. position isomers

Answer» Correct Answer - B
765.

Which of the following has primary alocholic group?A. B. C. D.

Answer» Correct Answer - A
766.

`C_6H_5-O-CH_3` can be named asA. phenoxy methaneB. phenetoleC. methoxy phenylD. methoxy benzene

Answer» Correct Answer - D
767.

Which one is a primary alcoholic group ?A. `-CH_(2)OH`B. C. D.

Answer» Correct Answer - A
768.

Butan-2-ol is a `:`A. primary alcoholB. secondary alcoholC. tertiary alcoholD. dihydric alcohol

Answer» Correct Answer - B
769.

Diethyl ether can be distinguished from butan-1-ol byA. aq. `FeCl_3`B. Na metalC. Tollens reagentD. Fehling reagent

Answer» Correct Answer - B
770.

3, 3-dimethyl butan-2-ol on dehydration givesA. 3, 3-dimethyl but-2-eneB. 2, 3-dimethyl but-2-eneC. 2, 3-dimethyl but-1-eneD. 3, 3-dimethyl but-1-ene

Answer» Correct Answer - B
771.

Give chemical test to distinguish between Butan-2-ol and 2-methylpropan-2-ol.  

Answer»

Lucas test: butan-2-ol react with Lucas reagent and milkiness appears within 5 min. but 2-methylpropan-2-ol react with the same to give milkiness immediately.

772.

Cyclohexanol is more soluble in water than 1-Hexanol.Explain.

Answer»

This is due to the reason that in Cyclohexanol, due to compact size of hydrocarbon part, it readily forms H-bond with water but in 1-hexanol, this is slightly hindered by the bulky alkyl group. 

773.

Which one of the following is a tertiary alcohol?(a) Pentan-l-ol (b) Pentan-2-ol (c) 2-Methylpentan-2-ol (d) 3-Methylpentan-2-ol

Answer»

Option : (c) 2-Methylpentan-2-ol

774.

A liquid was mixed with ethanol and a drop of concentrated `H_(2) SO_(4)` was added. A compound with a fruity smell was formed. The liquid wasA. `CH_(3)COCH_(3)`B. `PCl_(5)`C. `CH_(3)COOH`D. `CH_(3)CHO`

Answer» Correct Answer - C
775.

The hydrolysis of 2-bromo-3-methylbutane by `S_(N^(1))` mechanism gives mainly:A. 3-methyl -2-butanolB. 2-methyl -2-butanolC. 2,2-dimethyl-2-butanolD. 2-methyl-1-butanol

Answer» Correct Answer - B
776.

Glycerol on treatment with oxalic acid at `110^(@)C` formsA. Allyl alcoholB. Formic acidC. `CO_(2)` and `CO`D. Glyceric acid

Answer» Correct Answer - B
777.

Glycerol does not contain..... Alcoholic groupA. `1^(@)`B. `2^(@)`C. `3^(@)`D. `1^(@)` and `2^(@)`

Answer» Correct Answer - C
778.

Which of the following gives Iodo form testA. `CH_(3)-CH_(2)-CH_(2)-OH`B. `CH_(3)-CH_(2)-OH`C. `CH_(3)-CH(OH) - CH_(3)`D. Both 2 and 3

Answer» Correct Answer - D
779.

When ehtyl alcohol is distilled with bleaching powder and water then chloroform is obtained. The no. of moles of bleaching powder needed in the preparation of one mole of chloroform isA. 10B. 5C. 4D. 2

Answer» Correct Answer - C
780.

Ethyl cloride reacts with sodium ethoxide to form a compound (A)Which of the following reaction also yields (A) ?A. `C_(2)H_(5)Cl, KOH"(alc.)", Delta`B. `2C_(2)H_(5)OH," conc. "H_(2)SO_(4), 140^(@)C`C. `C_(2)H_(5)Cl, Mg "(dry ether)"`D. `C_(2)H_(2)," dil. "H_(2)SO_(4), HgSO_(4)`

Answer» Correct Answer - B
Ethyl chloride reacts with sodium ethoxide to form diethyl ether as
`C_(2)H_(5)Cl+NaOC_(2)H_(5) rarr underset("Diethyl ether")(C_(2)H_(5)-O-C_(2)H_(5))+NaCl`
Diethyl ether is also obtained by reaction of ethyl alcohol with conc. `H_(2)SO_(4)` at `140^(@)C`.
781.

Which of the following is a tertiary alcoholA. `(CH_(3))_(2) CHCH_(2)OH`B. `CH_(3)CH_(2)CH_(2)CH_(2)OH`C. `CH_(3)CH_(2)CH_(2)OH`D. `(CH_(3))_(3)COH`

Answer» Correct Answer - D
782.

When vapours of an alcohol are passed over hot reduced copper, it gices an alkene. The alcohol isA. PrimaryB. SecondaryC. TertiaryD. None of these

Answer» Correct Answer - C
783.

Which of the following is a tertiary alcoholA. Ethyl alcoholB. Isopropyl alcohoC. Neopentyl alcoholD. 2-Methyl propan-2-ol

Answer» Correct Answer - D
784.

A compound X with moleuclar formula `C_(3)H_(8)O` can be oxidized to a compoud Y with the molecular formula `C_(3)H_(6)O_(2)`. X is most likely to be a:A. AldehyeB. AlcoholC. EtherD. Both 2 and 3

Answer» Correct Answer - B
785.

Action of bleaching powder on ethyl alcohol givesA. CholoformB. DichloromethaneC. TrichloroethaneD. Ethylenechloride

Answer» Correct Answer - A
786.

Ethyl cloride reacts with sodium ethoxide to form a compound (A)Which of the following reaction also yields (A) ?A. `C_(2)H_(5)ClKOH(alc)Delta`B. `2C_(2)H_(5)OHconcH_(2)SO_(4)140^(@)C`C. `C_(2)H_(5)ClMg("dry ether")`D. `C_(2)H_(2)dilH_(2)SO_(4)HgSO_(4)`

Answer» Correct Answer - B
787.

When tertiary butyl alcohol is passed over reduced copper, the reaction taking placed isA. oxidationB. reductionC. dehydrationD. substitution

Answer» Correct Answer - C
788.

A compound reacts with sodium and liberates hydrogen and on oxidation gives ketone. The formula of the compound could beA. `CH_(3)CH_(2)OH`B. `CH_(3)CHOHCH_(3)`C. `CH_(3)CH_(2)CH_(2)OH`D. `CH_(3)CH_(2)CH_(2)CH_(2)OH`

Answer» Correct Answer - B
789.

In the reaction `(CH_(3))_(3)C-O-CH_(2)CH_(3)+underset((1"mole"))(HI)overset(heat)(rarr)` the products formed is (are)A. `(CH_(3))_(3)C-OHand CH_(3)CH_(2)I`B. `(CH_(3))_(3)C-I and CH_(3)CH_(2)OH`C. `(CH_(3))_(3)C-I and CH_(3)CH_(2)I`D. `C(H_(3)C)_(3)-underset(H)underset(|)O^(+)-CH_(2)CH_(3)I^(-)`

Answer» Correct Answer - B
790.

Ethyl alcohol on oxidation with acidified `K_(2)Ce_(2)O_(7)` givesA. `CH_(3)COCH_(3)`B. `HCOOH`C. `CH_(3)COOH`D. `HCHO

Answer» Correct Answer - C
791.

Compound A reacts with Na metal to give B. A also reacts with `PCl_(5)` to give C. B and C reacts with each other to give dimethyl ether. Then A, B and C respectively areA. `CH_(3)OH, CH_(3)ONa, CH_(3)COCl`B. `CH_(3)OH, CH_(4), CH_(3)Cl`C. `CH_(3)OH, CH_(3)ONa, CH_(3)Cl`D. `CH_(3)Cl, CH_(4), CH_(3)OH`

Answer» Correct Answer - C
792.

How many of the following compounds would give turbidity with lucas reagent without heating (1) Benzyl alcohol (2) Allyl alcohol (3) Cyclohexanol (4) 20,ethyl -2-proponol (5) Neopentanol (6) Phenol (7) O-cresol (8) Cylopropyl methyl carbionol (9) P-Nitro benzyl alcohol

Answer» Correct Answer - 4
793.

Which of the following reagents can distinguish ethyl methyl either from isopropyl alcohol ?A. `Br_(2)CCl_(4)`B. `AgNO_(3)//NH_(4)^(+)OH^(-)`C. `I_(2) and NaOH`D. `CuCl//NH_(4)^(+)OH^(-)`

Answer» Correct Answer - C
794.

In the sequence of reaction (A) is `(A)overset(Na)rarr` (B) `overset(C_(2)H_(5)I//heat)rarr` (C) `overset(HI//heat)rarr C_(2)H_(5)I`A. Acetic acidB. Methyl alcoholC. Ethyl alcoholD. Propionic acid

Answer» Correct Answer - C
795.

The major product obtained when tert- butyl bromide is heated with sodium ethoxide isA. 2-Methy1-1-propeneB. EheneC. tert- Buty1methy1etherD. Diethyl ether

Answer» Correct Answer - A
796.

Which of the following on oxidation gives ketoneA. `CH_(3) - CH_(2) - CH_(2) - OH`B. `CH_(3) - CH_(2) - OH`C. `CH_(3) - CH_(2) - CH_(2) - CH_(2) - OH`D. `CH_(3) - underset(OH)underset(|)(CH) - CH_(3)`

Answer» Correct Answer - D
797.

Which of the following compounds is produced when this reaction rakes place ? `CH_(3)-underset(CH_(3))underset(|)CH-OCH_(3)overset(HI)underset(cold)rarr`A. `CH_(3)-overset(CH_(3))overset(|)CH-OH`B. `CH_(3)-OH`C. Both of theseD. None of these

Answer» Correct Answer - A
798.

How many of the following compounds would give Iodoform test (1) `s CH_(3) - CO - CH_(2) - CO - OCH_(3)` (2) `C_(6) H_(5) - CO - CH_(2) - CO - C_(6)H_(5)` (3) `CH_(3) - CHCl - CH_(2) - CH_(3)` (4) `CH_(3) - CHNH_(2) - CH_(3)` (5) `CH_(3) - CO - CH_(2)I` (6) `CH_(3) - CO - O - CO - CH_(3)` (7) `CH_(3) - CO - O - CH_(3)` (8) `CH_(3) - CO - Cl` (9) `CH_(3) - CHOH - CH_(2) - CH_(3)` (10) `CH_(3) - CO - CH_(2) - CHOH - CH_(3)`

Answer» Correct Answer - 6
799.

Ethyl alcohol forms X `CaCl_(2)^(3). C_(2)H_(5)OH` when `C_(2)H_(5)OH` reacts with respective anhydrous salts. ThenA. `X = 3, Y = 3, Z = 2`B. `X = 3, Y = 6, Z = 3`C. `X = 3, Y = 7, Z = 4`D. `X = 4, Y = 4, Z = 4`

Answer» Correct Answer - B
800.

`HBr` reacts with `CH_(2)=CH-OCH_(3)` under anhydrous conditions at room temperature to give:A. `H_(3)C-CHBr-OCH_(3)`B. `CH_(3)CHO and CH_(3)Br`C. `BrCH_(2)CHOand CH_(3)OH`D. `BrCH_(2)-CH_(2)-OCH_(3)`

Answer» Correct Answer - A