Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.	Methyl cyanide on dilution with HCl produces
Answer» `CH_(3)COOH` `HCOOH` `CH_(3)-CO-CH_(3)` `CH_(3)-CHO` ANSWER :A

2.	Methyl cyanide is less basic than methylamine because
Answer» there is a triple bond between CARBON and NITROGEN atoms. molecular weight is higher than methylamine. the lone pair of electrons in nitriles belongs to sp - orbital and lone pair of electrons in AMINES belongs to `sp^(3)-` orbital. None of these Solution :`CH_(3)-C-= underset(sp)overset(* )(N)""CH_(3)-underset(sp^(3))(overset( *)NH_(2))`

3.	Methyl chloride reacts with silver acetate to yield
Answer» Acetaldehyde Acetyl chloride Methyl acetate Acetic acid Answer :C

4.	Methyl chloride reacts with silver acetate to yield :
Answer» ACETIC acid Methyl acetate Acetyl chloide Acetaldehyde Answer :B

5.	Methyl cyanide can be converted into acetic acid by :
Answer» REDUCTION Hydrolysis Electrolysis Decarboxylation Answer :B

6.	Methyl carboium ion si isoelectronic with,
Answer» `CH_(4)` `:C Cl_(2)` `CH_(3)^(-)` `F^(-)` Solution :`CH_(3)^(+)`is a methyl carboniumion having SIX electrons in outer most ORBIT. It is isoelectronic with `C Cl_(2)` (dicholor carbene), it ALSO contains six electrons in outer most orbit.

7.	Methyl chloride on treatment with Potassium cyanide followed by hydrolysis yields:
Answer» HCOOH `CH_3`COOH `CH_3`CN `CH_3`COOK Answer :B

8.	Methyl carbinol is
Answer» ETHANOL propan-2-ol propan-1-ol methanol Answer :A

9.	Methyl butane on reacting with bromine in the presence of sunlight gives mainly
Answer» 1- BROMO -2- methyl butane 2- bromo -2- methyl butane 2- bromo -3- methyl butane 1- bromo -3- methyl butane Answer :B

10.	Methyl bromide when heated with zinc in closed tube, produces
Answer» Methane Ethylene Ethane Methanol Answer :C

11.	Methyl bromide is not used :
Answer» As an insectiside A DISINFECTANT For DYEING clothes As disinfectant for YOUNG FRUIT trees. Answer :C

12.	Methyl bromide reacts with silver acetate to give :
Answer» Acetic acid Acetyl chloride METHYL acetate Acetaldehyde SOLUTION :`CH_(3)Br+CH_(3)COOAgrarrunderset("Methyl acetate")(CH_(3)COOCH_(3))+AgBr`

13.	Write the relavant chemical equations : Methyl bromide to propanone
Answer» SOLUTION :`CH_(3)-Br overset(KCN)RARR CH_(3)-CN overset(H_(3)O^(+))rarr CH_(3)COOH overset(Ca)rarr (CH_(3)COO)_(2)Ca overset("distillation")rarr CH_(3)COCH_(3)`

14.	Methyl bromideis convertedintoethanebyheatingitinethermediumwith :
Answer» Al Zn Na Cu Answer :C

15.	Methyl bromide is converted into ethane by heating it in ether medium with
Answer» Al Zn Na Cu Solution :An ether solution of alkyl halide when treated with sodium, it removes the HALOGEN of alkyl halide and the two alkyl radicals join together to FORM an alkane. This reaction is CALLED Wurtz reaction. `CH_(3)Br+2Na+Br CH_(3) overset("DRY ether")rarr UNDERSET("ethane")(CH_(3)-CH_(3))+2NaBr`

16.	Methyl bromide when heated with zinc in a closed tube produces:
Answer» Methane Ethane Ethylene Methanol Answer :B

17.	Methyl benzoate is reduced by di - isobut aluinium hydride gives
Answer» ANSWER :C

18.	Methyl benzoate can prepared by
Answer» `C_(6)H_(5)COOH+CH_(3)OH overset(H^(+))to` `C_(6)H_(5)COCl+CH_(3)OH overset("Pyridine")to` `C_(6)H_(5)COOH+CH_(2)N_(2) to` all the above methods Solution :All OPTION is correct

19.	Methyl benzoate can be prepared by :
Answer» `C_6H_5COOH + CH_3 OH OVERSET(H^(+))to` `C_6H_5COCl + CH_3OH overset("PYRIDINE")to ` `C_6H_5COOH + CH_2N_2 to` All the above methods. Answer :D

20.	Methyl amineis formedby reduction of
Answer» NITROETHANE METHYL cyanide FORMAMIDE Acetaldoxime ANSWER :C

21.	Methyl amine on heating with CHCl_3 and KOH gives:
Answer» Methanol Carbylamine Methanamide Methyl cyanide Answer :B

22.	Methyl amine in water reacts with ferric chloride to precipitate ferric hydroxide. Why ?
Answer» SOLUTION :`CH_3NH_2 + H_2O RARR CH_3NH_3 + OH^-` `FeCl_3 + 3OH^- rarr Fe(OH)_3 + 3CL^- 1`

23.	Methyl-alpha-D-glucoside and methyl- beta-D- glucoside are
Answer» epimers anomers enantiomers conformational diastereomers Answer :B

24.	Methyl-alpha-D-glucoside and methyl-beta-D-glucoside are
Answer» EPIMERS anomers ENANTIOMERS conformational DIASTEREOMERS SOLUTION : The isomers which are DIFFERING in configuration at asymmetric carbon produced due to ring formations are known as anomers.

25.	Methyl alcohol when reacted with carbon monoxide using cobalt or rhodium as catalyst , compound underlineA is formed . underlineA on heating with HI in the presence of red phosphorus as catalyst underlineB is formed . Identify underlineB
Answer» `CH_(3) COOH` `CH_(3) CHO` `CH_(3) CH_(2) I` `CH_(3) CH_(3)` Answer :D

26.	Methyl alcohol reacts with phosphorus trichloride to from:
Answer» METHANE METHYL chloride Accetyl chloride Dimethyl ether Answer :B

27.	Methyl alcohol on oxidation with acidified K_2Cr_2O_7 giyes
Answer» `CH_3COCH_3` `CH_3CHO` HCOOH `CH_3COOH` ANSWER :C

28.	Methyl alcohol on oxidation with acidified K_2Cr_2O_7 gives
Answer» `CH_3OH` HCOOH `CH_3COCH_3` `CH_3COOH` ANSWER :B

29.	Methyl alcohol on oxidation with acidified K_2Cr_2O_7 gives :
Answer» `CH_3COCH_3` `CH_3CHO` HCOOH `CH_3COOH` ANSWER :C

30.	Methyl alcohol is used ________.
Answer» for DRY cleaning PREPARATION of perfumesand VARNISHES as an antifreeze AGENT for AUTOMOBILE radiators in all of these Answer :D

31.	Methyl alcohol is toxic. The reason assigned is
Answer» It stops respiratory track It reacts with nitrogen and forms `CN^(-)` in the lungs It INCREASE `CO_(2)` content in the blood It is reduction PRODUCT of formaldehyde Answer :B

32.	Methyl alcohol is toxic. The reason assigned is:
Answer» It stops RESPIRATORY track It reacts with nitrogen and forms `CN^(-)` in the lungs It increases `CO_(2)` content in the blood It is a reduction PRODUCT of formaldehyde Answer :B

33.	Methyl alcohol is perpared from heatingof
Answer» `(CH_(3))_(4)NH` `(CH_(3))_(3)N -C_(2)H_(5) OH` `CH_(3) - NH-CH_(3)` `CH_(3) - CH_(2) -NH_(2)` SOLUTION :`(CH_(3)) - NOH overset(Delta)to CH_(3) - OH + (CH_(3))N `

34.	Methyl alcohol is _______acidic than ethyl alcohol :
Answer» Less More Equally None Answer :B

35.	Methyl alcohol can be distinguished from ethyl alcohol using
Answer» Fehling solution Schiff's reagent Sodium HYDROXIDE and iodine Phthalein fusion test Solution :`C_(2)H_(5)OH UNDERSET("IODOFORMTEST")overset(NaOH//I_(2))to CHI_(3))` (yellow PPT) `CH_(3)OH overset(NaOH//I_(2))to ` No ppt

36.	Methyl acetate is hydrolyzed with 0.1 N HCl at 25^(@)C. 5mL of the reacting mixture is withdrawn at various time intervals and is quickly titrated is withdrawn NaOH. The volume of NaOH consumed are as follows: \|{:("Time (s)",339,1242,2745,4546,oo),("vol of NaOH (mL)",26.34,27.80,29.70,31.81,39.81):}\| Show that the hydrolyiss is a first order reaction. Also find the rate constant (k).
Answer» Solution :For ester hydrolyiss, equation`k = (2.303)/(t)LOG.(V_(oo)-V_(0))/(V_(oo)-V_(t))` Since `V_(0)` is not given Let `V_(oo)-V_(0) = c_(0)` and `V_(oo) - V_(t) = c_(t)`. When `t = t_(1)` `:. k = (2.303)/(t_(1))log.(c_(0))/(c_(t_(1)))`...(i) ismilarly, when `t = t_(2)` `k = (2.303)/(t_(2))log.(c_(0))/(c_(t_(2)))`...(ii) Oprating EQ.(i) Eq. (ii), we GET `k(t_(1)-t_(2)) = 2.303log.(c_(t_(2)))/(c_(t_(1)))` or `k = (2.303)/((t_(1)-t_(2)))log.(c_(t_(2)))/(c_(t_(1)))` ...(iii) Now find `c_(t)`. and `t_(1) - t_(2) = 339 - 1242 = -903 s` `t_(1)-t_(3) = 339 - 2745 = -2406 s` `t_(1)-t_(4) = 339-4546=-4207 s` Uisng relation given in Eq. (iii), `:. k_(1) = (2.303)/(-903)log.(12.0)/(13.47) = -0.0025 XX log(0.89)` `= -0.0025 xx -0.0506 = 1.27 xx 10^(-4) s^(-1)` `k_(2) = (2.303)/(-2406)log.(10.11)/(13.47) = -0.00095 xx log(0.75)` `= -0.00095 xx -0.1249 = 1.19 xx 10^(-4) s^(-1)` `k_(3) = (2.303)/(-4207)log.(8.0)/(13.47) = -0.00054 xx log(0.59)` `= -0.00054 xx -0.2291 = 1.23 xx 10^(-4) s^(-1)` `k_("avergae") = 1.23 xx 10^(-4) s^(-1)`

37.	Methyl alcohol.
Answer» Solution :(1) Methyl ALCOHOL is used as an industrial SOLVENT for dissolving OILS, fats, gums ETC. (2) It is used for dry CLEANING and preparation of perfumes and varnishes. (3) It is used as antifreeze agent for automobile radiators at low temperature. (4) It is used in the preparation of methyl chloride, dimethyl sulphate and formaldehyde. (5) It is used to denature ethyl alcohol.

38.	Methyl acetate is formed from methyl alcohol and what?
Answer» ACETIC acid Acetic unhydride Acetyl chloride All of these Answer :D

39.	Methyl acetate and ethyl acetate can be distinguished by:
Answer» hot alakline `KMnO_(4)` NEUTRAL `FeCl_(3)` Iodoform test none of these Answer :C

40.	Methyl 2 -methyl propanoate is reduced by DIB-Al-H gives
Answer» 2-METHYL PROPANOIC acid 3-methyl butan-2-one `ALPHA`-methyl propionic acid 2-methyl propanal Answer :D

41.	methyl acetate and ethyl acetate can be distinguished by
Answer» Hot ALKALINE `KMnO_(4)` Neutral `FeCl_(3)` Iodoform TEST None of the above Solution :Iodoform test is carried out in hot alkaline medium, under these CONDITIONS the esters will hydrolyse to give CORRESPONDING alcohols. Now ethyl alcohol will respond to iodoform test to give yellow ppt. of iodoform whiel methanol will give no iodoform test.

42.	Methoxy methane and ethanol are of which type isomers ?
Answer» FUNCTIONAL GROUP Optical Position Chain SOLUTION :Functional group

43.	Methoxybenzene on treatment with HI Produce
Answer» IODOBENZENE and methanol PHENOL and METHYL IODIDE iodobenzene and methyl iodide phenol and methanol. Solution :

44.	Methoxy ethane is obtained by C_2H_5OH and what ?
Answer» `CH_3Cl` `CH_3ONa` `CH_2N_2` `CH_2Cl_2` ANSWER :C

45.	Methoxy benzene is prepared from CH_3-Cl and what?
Answer» phenol sodium benzoate sodium phenoxide benzyl chloride Answer :C

46.	Methoxy ethane does not react with
Answer» HI HBr dil. `H_2SO_4` Na Answer :D

47.	Methoxy benzene is called anisole How many more structure can be drawn for the same formula ?
Answer» 5 4 3 2 Answer :B

48.	Method used for obtaining highly pure silicon which is used as a semiconductor material, is
Answer» oxidation electrochemical crystallization zone REFINING SOLUTION :Siobtainedbyreductionof `SI CI_2 ` with ` H_2 `is furtherpurifiedbyzonerefiningto getSI ofveryhighpuritySiliconispurifiedbyzone- refininf processbecausetheimpuritiespresentin it aremoresolublein thehliquidphasethan INTHE soledphase .

49.	Method used for obtaining highly pure silicon used as a semiconductor material is
Answer» Oxidation Electrochemical Crystallization ZONE refining Solution :By the process of zone refinig PURE silicon is obtained which is USED in SEMICONDUCTOR.

50.	Method used for obtaining highly pure silicon used as a semiconductor material, is
Answer» Oxidation Electrochemical Crystallization Zone refining Solution :SI obtained by reduction of `SiCl_(4) with H_(2)` is further purified by zone refining method to get Si of very high purity. Silicon is purified by zone-refining process because the impurities PRESENT in it are more soluble in the liquid phase than in the solid phase.