Explore topic-wise InterviewSolutions in Current Affairs.

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1.	Benzaldehyde to 3-phenylpropan-1-ol
Answer» SOLUTION :

2.	Benzaldehyde reduces Tollen's reagent but not Fehling's solution explain.
Answer» Solution :Benzaldehyde reduces Tollen's reagent, but does not REDUCE Fehling's solution. Because `AG^(+)` is more EASILY reduced to Ag than `Cu^(2+)" to "Cu^(+)`

3.	Benzaldehyde reacts with ethanolic KCN to give
Answer» `C_(6)H_(5)CHOHCN` `C_(6)H_(5)CHOHCO OH` `C_(6)H_(5)CHOH CO C_(6)H_(5)` `C_(6)H_(5)COCOC_(6)H_(5+)`. Solution :Benzoin CONDENSATION `C_(6)H_(5)-overset(O)overset(\|\|)underset(H)underset(\|)(C) + overset(O)overset(\|\|)underset(H)underset(\|)(C) -C_(6)H_(5) overset(KCN)to C_(6)H_(5)-overset(O)overset(\|\|)(C)-overset(H)overset(\|)underset(OH)underset(\|)(C)-C_(6)H_(5)`

4.	Benzaldehyde reacts with methyl amine to gives :
Answer» `C_6H_5NH_2` `C_6H_5CH_2NH_2` `C_6H_5CH=NCH_3` `C_6H_5CONH_2` ANSWER :C

5.	Benzaldehyde reacts with ethanoic KCN to give
Answer» `C_6H_5CHOHCN` `C_6H_5CHOHCOC_6H_5` `C_6H_5CHOHCOOH` `C_6H_5CHOHCHOHC_6H_5` SOLUTION :When benzaldehyde is refluxed with aqueous alcoholic potassium cyanide, two MOLECULES of benzaldehyde condense together to form BENZOIN

6.	Benzaldehyde reacts with ammonia to from
Answer» benzaldehyde ammonia UROTROPINE hydrbenzamide ammonium chloride Solution :`underset("benzaldehyde")(3C_(6)H_(5)CHO)+2NH_(3)overset(-2H_(2)O)to`

7.	Benzaldehyde on reduction by using NaHg + H_2O gives
Answer» BENZYL alcohol phenol sodium benzoate sodium phenoxide Answer :A

8.	Benzaldehyde on nitrating gives
Answer» <P>o-nitrobenzaldehyde p- nitrobenzaldehyde mixture of a and b m- nitrobenzaldehyde Answer :D

9.	Benzaldehyde on reaction with acetophenone in the presence of sodium hydroxide solution gives
Answer» `C_(6)H_(5)CH=CHCOC_(6)H_(5)` `C_(6)H_(5)COCH_(2)C_(6)H_(5)` `C_(6)H_(5)CH=CHC_(6)H_(5)` `C_(6)H_(5)CH(OH)COC_(6)H_(5)` Solution :`C_(6)H_(5)CHO + CH_(3)COC_(6)H_(5) overset(NaOH)UNDERSET(-H_(2)O)rarr underset("Benzyl acetophenone")(C_(6)H_(5)-CH=CH-overset(O)overset(\|\|)(C)-C_(6)H_(5))`

10.	Benzaldehyde on mild oxidation gives
Answer» `C_6H_3COOH` `C_6H_5CH_2OH` `C_6H_5COCH_3` `CO_2` ANSWER :A

11.	Benzaldehyde on heating with concentrated NaOH gives
Answer» Phenol the reduction PRODUCT and SODIUM benzoate the oxidation product Benzyl ALCOHOL the reduction product and sodium benzoate the oxidation product Sodiumbenzoate the reduction product and benzylalcohol the oxidation product Sodiumbenzoate the reduction product and phenolalcohol the oxidation product Answer :B

12.	Benzaldehyde is treated with acetaldehyde in presence of dilute alkali. What happens ?
Answer» Solution :When benzaldehyde reacts with ACETALDEHYDE, first unstable `beta` - hydroxy aldehyde is formed which loses a molecule of water to form CINNAMALDEHYDE. `C_6H_5CHO +CH_(3) CHOoverset("dil")underset(NaOH)RARR` `C_6H_5-CH(OH) CH_2CHOoverset("HEAT")underset(-H_2O)rarr C_6H_5-CH=CHCHO`

13.	Benzaldehyde is obtained from toluene by
Answer» ROSENMUND's reduction Cannizzaro REACTION KOLBE's reaction Etard reaction Answer :D

14.	Benzaldehyde is obtained from Rosenmund's reduction of
Answer» ANSWER :B

15.	Benzaldehyde is converted to benzyl alcohol by
Answer» Wurtz reaction Fitting reaction Wurtz fittings reaction Cannizzaro's reaction Solution :We know that benzaldehyde which does not contai `alpha`- HYDROGEN atom, undergoes self oxidation - reduction when reacted with `50%` aqueous ALKALI. In the process of converting benzaldehyde to benzly ALCOHOL, one molecule is oxidesed to SODIUM benzoate at the expense of other which is reduced to BENZYL alcohol. This reactio is know as Cannizzaro's reaction.

16.	Benzaldehyde from toluene (commerical method)
Answer» SOLUTION :SIDE chainchlorination of toluene gives BENZAL chloride which on HYDROLYSIS gives nenzaldehyde.

17.	Benzaldehyde from toluene.
Answer» Solution :When toluene is TREATED with solution of chromyl chloride `(CrO_(2)Cl_(2))` in `Cs_(2)`, brown chromium complex is obtained, which on ACID hydrolysis gives BENZALDEHYDE. This reactiion is called Etard reaction.

18.	Benzaldehyde from benzoyl chloride.
Answer» Solution :When BENZOYL CHLORIDE is hydrogenated in the PRESENCE palladium on BARIUM sulphate `(Pd//BaSO_(4))`, benzaldehyde is OBTAINED. This reaction is called rosemund reduction.

19.	Benzaldehyde from benzene (Gatterman-Koch synthesis).
Answer» Solution :When benzene is treated with vapours of carbon monoxide and HYDROGEN CHLORIDE in the presence of a CATALYST mixture of `AlCl_(3)` and `CuCl` under high pressure BENZALDEHYDE is obtained.

20.	Benzaldehyde gives a positive test with Tollen's reagent but not with Fehling's and Benedict solutionws. Why ?
Answer» Solution :It id due to STRONGER oxidizing nautre of Tollen's reagent as COMPARED to Fehling and Benedict's solution and cannot oxidise benzaldehyde to benzoic acid. In GENERA, all these THREE can oxidise aliphatic ALDEHYDES.

21.	Benzaldehyde does not undergo Aldol condensation, whereas acetal dehyde does because _____.
Answer» ANSWER :BENZALDEHYDE does not contain alpha - HYDROGEN ATOM

22.	Benzaldehyde does not reduce Fehling solution but forms silver mirror with _____.
Answer» ANSWER :TOLLEN's REAGENT.

23.	Benzaldehyde condenses with N, N - dimethyl aniline in the presence of strong acids to form................ .
Answer» SOLUTION :Triphenyl METHANE dye or malachite GREEN dye

24.	Benzaldehyde condenses with N, N - dimethyl aniline in the presence of strong acid to give ________.
Answer» BENZAL aniline Cinnamic acid Schiff's base Malachite GREEN dye Answer :D

25.	Benzaldehyde condenses with acetaldehyde to form ........
Answer» SOLUTION :CINNAMALDEHYDE

26.	Benzaldehyde canbe prepared from benzene by passing vapours of ……. and ……… in its solutionin presence of catalystmixture of aluminium chlorideand cuprous chloride. The reactionis known as …….. .
Answer» `HCl, SnCl_(4)`, Rosenmundreduction `CO, HCl`, Gattermann-Koch reaction `CO_(2),H_(2)SO_(4)`, Clemmensenreduction `O_(3),` alcohol, Wolff-Kishner reduction Solution :

27.	Benzaldehyde can be prepared from
Answer» ANSWER :A

28.	Benzaldehyde can be prepared from benzene by passing vapoures of …..and …… in its solution is presence of catalyst mixture of aluminium chloride and cuprous chloride. The reaction is known as …….
Answer» HCl, `SnCl_(4)` , ROSENMUND reduction CO, HCl, Gattermann-Kocj REACTION `CO_(2), H_(2)SO_(4)`, Clemmensen reduction `O_(3)`, alocohol, Wolff-Kishner reduction. Answer :B

29.	Benzaldehyde can be prepared by the hydrolysis of benzal chloride.
Answer» ANSWER :T

30.	Benzaldehyde can be oxidised to corresponding carboxylate anion with
Answer» FEHLING's reagent TOLLEN's reagent Both Fehling's and Tollen's reagent Neither Fehling's nor Tollen's reagent Answer :B

31.	Benzaldehyde can be prepared by oxidation of toluene with
Answer» ACIDIC `KMnO_4` `K_2Cr_2O_7` ` CrO_2Cl_2` All Answer :C

32.	Benzaldehyde can beprepared by hydrolysis of
Answer» BENZYL CHLORIDE BENZAL chloride Benzotrichloride benzonitrile Answer :B

33.	Benzaldehyde and phenyl magnesium halide gives
Answer» BENZYL alcohol diphenyl ketone diphenyl ethanol diphenyl methanol Answer :D

34.	Benzaldehyde and CH_(3)COCl can be distinguished by
Answer» TOLLEN's test Bendict's test Iodoform test 2,4,DNP test Solution : gives Tollen's test 2,4-DNP test, Benedict's test, iodoform test and does not give Fehling's test. `CH_(3)CHO` gives Tollen's test 2,4DNP test, Fehling's test, Benedict's test iodoform test . Hence CHOICES (b) and (c) are CORRECT but choice (a) and (d) are incorrect.

35.	Benzaldehyde and acetone can best distinguished using
Answer» Fehling's solution sodium hydroxide solution 2,4-DNP Tollen's reagent Solution :Benzaldehyde is a weak REDUCING reducing agent. It REDUCES ammoniacal silver mirror. `C_(6)H_(5)CHO+Ag_(2)Oto2Agdarr+C_(6)H_(5)COOH` ACETONE is not easily oxidised & hence, does not give the Tollen.s test.

36.	Benzaldehyde and acetone can be best distinguished using
Answer» Fehling's solution Sodium hydroxide solution 2,4-DNP Tollen's reagent Solution :Benzaldehyde is a WEAK reducing AGENT. It reduces ammoniacal silver nitrate solution to give silver mirror. `C_(6)H_(5)CHO + Ag_(2)O rarr 2Ag darr + C_(6)H_(5)COOH` ACETONE is not easily oxidised & hence, does not give the Tollen's test.

37.	Benzaldehyde and acetaldehyde can be distinguish by :
Answer» Hinsberg REAGENT Tollen's reagent Baeyers reagent IODOFORM test Answer :D

38.	Benzaldehyde and acetaldehyde can be distinguished by:
Answer» Iodoform TEST 2 : 4 DNP test `NH3` reaction Wolff Kishner reduction Answer :A

39.	Benzal chloride on hydrolysis gives
Answer» benzoic ACID benzaldehyde benzo CHLORIDE benzyl chloride Answer :B

40.	Benene diaxonium chloride in aqeous solution decomposes as : C_6H_5-N=N^(+)Cl_(aq)^(-) +H_2O_(aq)rarrC_6H_5OH_(aq)+N_2(g)+HCl_(aq) The reaction follows first order kinetics. If P_t is the pressure of N_2 at constant volume and temperature corresponding to different intervals of time t and p_f that after completion of the reaction, then which of the following graphs conforms to the kinetics of the reaction ?
Answer» ANSWER :C

41.	Benedict.s solution provides:
Answer» `Ag^+` `Cu^+` `BA^+` `LI^+` Answer :B

42.	Benedryl a well known drug contains the following group :
Answer» PRIMARY amine Diazonium group Secondary amine Tertiary amine Answer :D

43.	Benedict's solution is similar to:
Answer» FENTON reagent Fehling's solution Schiff's base None Answer :B

44.	Benedict's solution is not reduced by
Answer» Formaldehyde Acetaldehyde Glucose Acetic anhydride Solution :BENEDICT solution is readily reduced by ALDEHYDE. It does not oxidise ANHYDRIDES.

45.	Benedict's reagent is :
Answer» Ammoniacal silver SOLUTION CONTAINING sodium potassium TARTRATE Copper SULPHATE solution containing sodium potassium tartrate Copper sulphate solution containing citrate ions Ammoniacal `Cu_2Cl_2` solution Answer :C

46.	Belstein test is used for :
Answer» N Cl Na `CO_(2)` ANSWER :B

47.	Benadryl is used as
Answer» antiseptic disinfectant analgesic antihistamine. Answer :D

48.	Below the point A, FeO-
Answer» can be REDUCED only by CO can be reduced by both CO and C can be reduced only by C cannot be reduced by EITHER C or CO Answer :A

49.	Below reaction sequence illustrates the various stages of reduction of nitric acid where a, b, c,d are the number of electrons involved in the reduction of 1 mole N-atoms HNO_(3) underset(ao)rarr NO_(2) underset(bo)rarr NO underset(co)rarr N_(2)O underset(do)rarr NH_(3) Find the value of (2a + b + 3c -d)
Answer» ANSWER :`(B,d,E,F,G)`

50.	Below point ‘A’ FeO can
Answer» be reduced by carbon monoxide only. be reduced by both carbon monoxide and carbon. be reduced by carbon only. not be reduced by both carbon and CARBONMONOXIDE. Solution :Below POINT A, `Delta_fG_((CO","CO_2))^(THETA) < Delta_f_((Fe","FeO))^(Theta)`