94420 + Interview Questions in Chemistry in Class 12

1.	Iodoform reaction is answered by all, except
Answer» `underset(OH"")underset("\|")(CH_(3)-CH-CH_(2)-COOH` `CH_(3)CHO` `CH_(3)-CH_(2)-OH` `CH_(3)-CH_(2)-CH_(2)OH` Solution :Alcohols of the type, `CH_(3)-CH(OH)-R` ( where, R = H/alkyl/aryl groups) and carbonyl compounds having `H_(3)C-overset(O)overset("\|\|")C-` group give iodoform REACTION.

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2.	Iodoform is used as
Answer» ANTISEPTIC ANTIBIOTIC INSECTICIDE ANAESTHETIC ANSWER :A

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3.	IUPAC Name of : CH_(2)=CH-underset(CH_(2))underset(\|\|)(C)-C-=CH
Answer» 2-Propynyl buta-1,2-diene 4-Methylene hex-5-en-1-yne 3-Methylene hex-1-en-5-yne 2-Vinyl pent-1-en-4-yne Answer :C

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4.	Iodoform is used as ……..
Answer» ANAESTHETIC ANALGESIC ANTISEPTIC Anti-allergic ANSWER :C

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5.	IUPAC name of CH_2=CH-CH(CH_3)_2 is:
Answer» 1,1-dimethyl prop-2-ene 3-methyl but-1-ene 2-vinylpropane 1-isopropyl ethylene Answer :B

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6.	Iodoform is formed when ethanol is heated with :
Answer» POTASSIUM IODIDE and SODIUM hydroxide iodine and sodium hydroxide chloroform and iodine iodine and potassium iodide Answer :B

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7.	IUPAC name of CH_2 = CH -CH_3 group is :
Answer» Allyl Propyl Prop-2-enyl Prop-1-enyl Answer :C

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8.	Iodoform is formed by the reaction of alcohol with :
Answer» `CuCO_(3) + I_(2)` `Na_(2)CO_(3) + I_(2)` `CaCO_(3) + I_(2)` `ZnO + I_(2)` Answer :B

Discussion

9.	Iodoform is formed on warming iodine and sodium hydroxide with:
Answer» `C_2H_5OH` `CH_3OH` `HCOOH` `C_6H_6` ANSWER :A

Discussion

10.	IUPAC name of C_(6)H_(5) - overset(O)overset(\|\|)C - CH_(2)CH_(2)-CH_(2)-CH_(2)-CH_(3)
Answer» 1-phenylhexan-2-one 6-phenylhexan-2-one 1-benzylhexan - 2-one Dodecan-5-one ANSWER :A

Discussion

11.	Iodoform has antiseptic properties. Give one reason to support it.
Answer» SOLUTION :The antiseptic properties of IODOFORM is due to `I_(2)` which is LIBERATED when iodoform comes in contact with skin.

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12.	IUPAC name of carboxylic acid is
Answer» alkinoic ACID alkanoic acid alkenoic acid ALKYL ALKANOATE ANSWER :B

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13.	IUPAC name of CH-=C-C(CH_3)_3 is :
Answer» 2,2-dimethyl prop-1yne 3,3-dimethyl but-1yne 2-vinylpropane 1-isopropyiethene Answer :B

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14.	IUPACnameof C_(2)H_(5)CH(CH_(3))NH_(2)
Answer» ETHYL METHYLAMINE methyl ethyl AMINE 2-butanamine 1-butanamine Answer :C

Discussion

15.	Iodoform gives yellow ppt. on heating with aq. AgNO_3 solution but chloroform does not. This is because
Answer» IODOFORM is ionic while CHLOROFORM is COVALENT C-Cl bond in chloroform is much weaker than C-I bond in iodoform C-I bond in iodoform is weaker than C-CI bond in chloroform Chloroform is a LIQUID while iodoform is a solid Answer :C

Discussion

16.	IUPAC name of beta- methyl butyric acid is
Answer» 3-methylbutanoicacid 4- methylpentanoicacid 2-methylbutanoicacid 2-methylpropanoicacid Answer :A

Discussion

17.	Iodoform gives a precipitate with AgNO_3 on heating but chloroform does not because:
Answer» IODOFORM is ionic CHLOROFORM is covalent C-I BOND in iodoform is WEAK and C-Cl bond in chloroform is strong. None Answer :C

Discussion

18.	IUPAC name of (C_2H_5)_2CHCH_2OH is:
Answer» 2-ethylbutan-1-ol 2-methylpentan-1-ol 2-ethylpentan-1-ol 3-ethylbutan-1-ol Answer :A

Discussion

19.	Iodoform gives a precipitate with AgNO_(3) on heating but chloroform does not because :
Answer» IODOFORM is ionic C-I BOND in iodoform is weaker while C-Cl bond in chloroform is strong Iodoform is more reactive than chloroform Iodoform BEHAVES as an acid Answer :B

Discussion

20.	IUPAC name of beta-methyl butyraldehy de
Answer» 2-METHYL butanal 3- methyl butanal 2- methyl PROPANAL 3- methyl pentanal ANSWER :B

Discussion

21.	Iodoform (CHI_(3)).
Answer» Solution :(1) IODOFORM is used as antiseptic, DRESSING of wounds and sores. (2) On small SCALE it is used as DISINFECTANT.

Discussion

22.	Iodoform canbe prepared from all except
Answer» butan-2-one acetophenone propan-2-ol propan-1-o Answer :D

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23.	IUPAC name of benzyl chloride is chlorophenylmethane.
Answer»

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24.	Which ion cannot be precipitated from water:
Answer» `CH_3OH` `C_2H_5OH` `CH_3CHO` `CH_3COCH_3` ANSWER :A

Discussion

25.	Iodoform cannot be prepared from :
Answer» `CH_3OH` `C_2H_5OH` `CH_3CHO` `CH_3COCH_3` ANSWER :A

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26.	IUPAC name of benzophenone is
Answer» 2-phenylpropenal 3-phenylbutenal DIPHENYL methanone diphenyl ethanone Answer :C

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27.	Iodoform can be used in medicine as an
Answer» antiseptic anaesthetic antifebrin hypnotic Answer :A

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28.	IUPAC name ofalpha, alpha dichloro diethly ketone is
Answer» 2,4 - DICHLORO - 3- PENTANONE 1,4- dichloro - 2 - pentanone 1,4- dichloro - 2- pentanone 2,5 - dichloro - 3- pentanone Answer :B

Discussion

29.	Iodoform can be used as:
Answer» ANAESTHETIC ANTISEPTIC ANALGESIC Antifebrin ANSWER :2

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30.	IUPAC name of acrolein is prop-2-enal.
Answer» ANSWER :T

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31.	Iodoform can be used in medicine as :
Answer» Anaesthetic Antiseptic Analgesic Antifebrin Answer :B

Discussion

32.	Iodoform can be prepared from all except
Answer» isopropyl alcohol 3-methyl-2-butanone ISOBUTYL alcohol ethyl methyl ketone Solution :Isobutyl alcohol does not contain the group `CH_(3)CHOH-` or `CH_(3)CO`-attached to C or H and hence does not GIVE IODOFORM on treatment with `I_(2)//NaOH`

Discussion

33.	IUPAC name of acrolein is
Answer» but -2-enal prop-2-enal pentanal 2- METHYLPROPANAL ANSWER :B

Discussion

34.	Iodoform can be prepared from all, except
Answer» ISOBUTYL alcohol Ethyl methyl ketone Isopropyl alcohol 3-Methyl-2-butanone Solution :Isobutyl alcohol does not GIVE positive IODOFORM test. `CH_(3)CHCH_(2)OH`

Discussion

35.	Iodoform can be prepared from all except :
Answer» Ethyl METHYL ketone Isopropyl alcohol `3`-Methyl-`2`-butanone Isobutyl alcohol Solution :`CH_(3)-UNDERSET(CH_(3))underset(\|)(CH)-CH_(2)-OH` isobutyl alcohol doesno't GIVE POSITIVE iodoform test.

Discussion

36.	Iodoethane reacts with sodium in ether, the product formed is
Answer» Pentene Propyne Butene Butane Answer :D

Discussion

37.	IUPAC name of acrolein is:
Answer» Propanal Prop-2-en-l-al propan-2-ol Prop-I-en-2-al Answer :B

Discussion

38.	Iodoethane is treated with alcoholic KCN and the product obtained is hydrolysed with dil. HCl. The final product is :
Answer» Propanoic ACID Propanamide Propane NITRILE Butanoic acid Solution :`CH_(3)CH_(2)Ioverset("KCN")rarrCH_(3)CH_(2)CNoverset("dil.HCl")rarrunderset("Propanoic acid")(CH_(3)CH_(2)COOH)`

Discussion

39.	Iodobenzene( C_(6)H_(5)I) is prepared from aniline (C_(6)H_(5)NH_(2)) in a two step process as shown below C_(6)H_(5)NH_(2) + HNO_(3) + HCl to C_(6)H_(5)N_(2)""^(+)Cl^(-) +2H_(2)O C_(6)H_(5)N_(2) ^(+)Cl^(-) + Kl to C_(6)H_(5)I + N_(2) + KCl In an actual preparation 9.30 g of analine was converted to 16.32 g of iodobenzene . The percentage yeild of iodobenzene is : (I = 127 )
Answer» `8%` `50%` `75%` `80%` ANSWER :D

Discussion

40.	Iodobenzene from benzene iodine is obtained in presence of reducing agents.
Answer» SOLUTION :IODOBENZENE from benzene iodine is obatained in PRESENCE of oxidising agents.

Discussion

41.	aniline to iodobenzene
Answer» SOLUTION :ANILINE to IODOBENZENE :

Discussion

42.	Iodine test is shown by
Answer» Polypeptide GLYCOGEN Starch Glucose Solution :IODINE test is SHOWN by starch Starch `overset(I_(2))underset("iodide PAPER")to` Blue colour

Discussion

43.	Iodine solution stained on clothes can be removed by:
Answer» NaCl NaBr `Na_2S_2O_3` KI Answer :C

Discussion

44.	Iodine reacts with hot NaOH. The products are NaI and X. What is the oxidation state of Iodine in X ?
Answer» Solution :`3I_(2) + 6 NAOH RARR 5NaI + NaIO_(3) \|+ 3H_(2) O, NaIO_(3) = I` shows `+5`

Discussion

45.	IUPAC name of acetone is:
Answer» Ethanal Butanone Propanone Propanaldehyde Answer :C

Discussion

46.	Iodine reacts with sodium thiosulphate to form sodium iodide and :
Answer» SODIUM sulphide sodium tetrathionate sodium SULPHATE sodium sulphate + Sulphur. Answer :B

Discussion

47.	Iodine reacts with concentrated HNO_3 to yeild Y along with other products. The oxidation state of Y is ...........
Answer» 5 1 7 3 Solution :`HIO_(3)` is PRODUCED as oxidised PRODUCT.

Discussion

48.	Iodine reacts with hyp to give
Answer» NaI `Na_(2)S_(2)O_(3)` `Na_(2)S_(4)O_(6)` `Na_(2)SO_(4)` SOLUTION :`2Na_(2)S_(2)O_(3) + I_(2) RARR Na_(2) S_(4) O_(6) + 2NaI`

Discussion

49.	IUPAC name of acetic acid is :
Answer» ETHANOIC acid Methanoic acid Propanoic acid Butanoic acid Answer :A

Discussion

50.	Iodine oxidises the S_(2)O_(3)^(2-) ion to :
Answer» `SO_(3)^(2-)` `SO_(2)^(2-)` `S_(4)O_(6)^(2-)` `S^(2-)`. Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Iodoform reaction is answered by all, except

Iodoform is used as

IUPAC Name of : CH_(2)=CH-underset(CH_(2))underset(||)(C)-C-=CH

Iodoform is used as ……..

IUPAC name of CH_2=CH-CH(CH_3)_2 is:

Iodoform is formed when ethanol is heated with :

IUPAC name of CH_2 = CH -CH_3 group is :

Iodoform is formed by the reaction of alcohol with :

Iodoform is formed on warming iodine and sodium hydroxide with:

IUPAC name of C_(6)H_(5) - overset(O)overset(||)C - CH_(2)CH_(2)-CH_(2)-CH_(2)-CH_(3)

Iodoform has antiseptic properties. Give one reason to support it.

IUPAC name of carboxylic acid is

IUPAC name of CH-=C-C(CH_3)_3 is :

IUPACnameof C_(2)H_(5)CH(CH_(3))NH_(2)

Iodoform gives yellow ppt. on heating with aq. AgNO_3 solution but chloroform does not. This is because

IUPAC name of beta- methyl butyric acid is

Iodoform gives a precipitate with AgNO_3 on heating but chloroform does not because:

IUPAC name of (C_2H_5)_2CHCH_2OH is:

Iodoform gives a precipitate with AgNO_(3) on heating but chloroform does not because :

IUPAC name of beta-methyl butyraldehy de

Iodoform (CHI_(3)).

Iodoform canbe prepared from all except

IUPAC name of benzyl chloride is chlorophenylmethane.

Which ion cannot be precipitated from water:

Iodoform cannot be prepared from :

IUPAC name of benzophenone is

Iodoform can be used in medicine as an

IUPAC name ofalpha, alpha dichloro diethly ketone is

Iodoform can be used as:

IUPAC name of acrolein is prop-2-enal.

Iodoform can be used in medicine as :

Iodoform can be prepared from all except

IUPAC name of acrolein is

Iodoform can be prepared from all, except

Iodoform can be prepared from all except :

Iodoethane reacts with sodium in ether, the product formed is

IUPAC name of acrolein is:

Iodoethane is treated with alcoholic KCN and the product obtained is hydrolysed with dil. HCl. The final product is :

Iodobenzene from benzene iodine is obtained in presence of reducing agents.

aniline to iodobenzene

Iodine test is shown by

Iodine solution stained on clothes can be removed by:

Iodine reacts with hot NaOH. The products are NaI and X. What is the oxidation state of Iodine in X ?

IUPAC name of acetone is:

Iodine reacts with sodium thiosulphate to form sodium iodide and :

Iodine reacts with concentrated HNO_3 to yeild Y along with other products. The oxidation state of Y is ...........

Iodine reacts with hyp to give

IUPAC name of acetic acid is :

Iodine oxidises the S_(2)O_(3)^(2-) ion to :