11242 + Mcqs in Chemistry Page 144 McqOptions

7151.	Froth floatation process is used for concentration of [MNR 1987; IIT 1989; UPSEAT 2000, 02]
A.	Chalcopyrite
B.	Bauxite
C.	Haematite
D.	Calamine
Answer» B. Bauxite

Discussion

7152.	'Lapis-Lazuli' is a blue coloured precious stone. It is mineral of the class [NCERT 1980; AIIMS 1980; BHU 1978, 80]
A.	Sodium-alumino silicate
B.	Zinc cobaltate
C.	Basic copper carbonate
D.	Prussian blue
Answer» B. Zinc cobaltate

Discussion

7153.	Which is correct [MADT Bihar 1995]
A.	Galena : \[M{{g}_{2}}C{{O}_{3}}\]
B.	Cassiterite : \[CaC{{O}_{3}}\,MgC{{O}_{3}}\]
C.	Dolomite : \[Sn{{O}_{2}}\]
D.	Magnesite : \[MgC{{O}_{3}}\]
Answer» E.

Discussion

7154.	Black Jack is an ore of [PCET 2004]
A.	Cr
B.	Sn
C.	Zn
D.	Ni
Answer» D. Ni

Discussion

7155.	Which one of the following can be used as monomer in a polymerisation reaction [MP PMT 1993]
A.	\[C{{H}_{3}}C{{H}_{2}}Cl\]
B.	\[C{{H}_{3}}C{{H}_{2}}OH\]
C.	\[{{C}_{6}}{{H}_{6}}\]
D.	\[{{C}_{3}}{{H}_{6}}\]
Answer» E.

Discussion

7156.	Styrene at room temparature is
A.	Solid
B.	Liquid
C.	Gas
D.	Colloidal solution
Answer» C. Gas

Discussion

7157.	Perlon is [AFMC 2001]
A.	Rubber
B.	Nylon-6
C.	Terelene
D.	Oxlon
Answer» C. Terelene

Discussion

7158.	High density polyethylene (HDPE) can be prepared from ethylene by
A.	Ziegler-Natta process
B.	Heating with peroxides
C.	Condensing in sealed tubes
D.	Condensing with styrenes
Answer» B. Heating with peroxides

Discussion

7159.	In the manufacture of polythene by the Ziegler process using ethylene, the temperature for proper polymerisation required is
A.	Below \[{{10}^{o}}C\]
B.	\[{{10}^{o}}\text{ to }{{50}^{o}}C\]
C.	\[{{50}^{o}}\text{ to }{{80}^{o}}C\]
D.	\[{{80}^{o}}\text{ to }{{140}^{o}}C\]
Answer» D. \[{{80}^{o}}\text{ to }{{140}^{o}}C\]

Discussion

7160.	Polymer used in bullet proof glass is [MP PET 2004]
A.	Lexane
B.	PMMA
C.	Nomex
D.	Kevlar
Answer» C. Nomex

Discussion

7161.	Ebonite is [CBSE PMT 2000]
A.	Polropene
B.	Natural rubber
C.	Synthetic rubber
D.	Highly vulcanized rubber
Answer» E.

Discussion

7162.	?Celanese silk? is
A.	Cellulose trinitrate
B.	Cellulose acetate
C.	Cellophane
D.	Pyroxylin
Answer» C. Cellophane

Discussion

7163.	Which of the following is a chain growth polymer [CBSE PMT 2004]
A.	Polystyrene
B.	Protein
C.	Starch
D.	Nucleic acid
Answer» B. Protein

Discussion

7164.	Which of the following statement is correct regarding the drawbacks of raw rubber [AIIMS 2001]
A.	It is plastic in nature
B.	It has little durability
C.	It has large water-absorption capacity
D.	All of these
Answer» E.

Discussion

7165.	Wash and wear clothes are manufactured using
A.	Nylon fibres
B.	Cotton mixed with nylon
C.	Terylene fibres
D.	Wool fibres
Answer» D. Wool fibres

Discussion

7166.	Trans-form of polyisoprene is
A.	Guttapercha
B.	Hydrochloride rubber
C.	Buna-N
D.	Synthetic rubber
Answer» B. Hydrochloride rubber

Discussion

7167.	p-chloroaniline and anilinium hydrochloride can be distinguished by [IIT-JEE 1998]
A.	Sandmeyer reaction
B.	\[NaHC{{O}_{3}}\]
C.	\[AgN{{O}_{3}}\]
D.	Carbylamine test
Answer» C. \[AgN{{O}_{3}}\]

Discussion

7168.	Aniline reacts with acetaldehyde to form [MHCET 2004; AFMC 2004]
A.	Schiff's base
B.	Carbylamine
C.	Immine
D.	None of these
Answer» B. Carbylamine

Discussion

7169.	Which of the following would be most reactive towards nitration [AMU 2000; UPSEAT 2002]
A.	Benzene
B.	Nitro benzene
C.	Toluene
D.	Chloro benzene
Answer» C. Toluene

Discussion

7170.	The correct order of basicity?s of the following compounds is \[\underset{4}{\mathop{C{{H}_{3}}-\overset{O}{\mathop{\overset{\|\|}{\mathop{C}}\,}}\,-N{{H}_{2}}}}\,\] [IIT-JEE (Screening) 2001]
A.	\[2>1>3>4\]
B.	\[1>3>2>4\]
C.	\[3>1>2>4\]
D.	\[1>2>3>4\]
Answer» C. \[3>1>2>4\]

Discussion

7171.	The following compound on hydrolysis in aqueous acetone will give
A.	Mixture of (K) and (L)
B.	Mixture of (K) and (M)
C.	Only (M)
D.	Only (K)
Answer» B. Mixture of (K) and (M)

Discussion

7172.	Which of the following is the strongest base ? [AIEEE 2004]
A.
B.
C.
D.
Answer» E.

Discussion

7173.	The structural formula of Indigo dye is : [DPMT 2004]
A.
B.
C.
D.
Answer» D.

Discussion

7174.	Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be [CBSE PMT 2004]
A.
B.
C.
D.
Answer» B.

Discussion

7175.	A primary amine is formed an amide by the treatment of bromine and alkali. The primary amine has : [BHU 2004]
A.	1 carbon atom less than amide
B.	1 carbon atom more than amide
C.	1 hydrogen atom less than amide
D.	1 hydrogen atom more than amide
Answer» B. 1 carbon atom more than amide

Discussion

7176.	Nitroso amines \[({{R}_{2}}N-N=O)\] are soluble in water. On heating them with concentrated \[{{H}_{2}}S{{O}_{4}}\] they give secondary amines. The reaction is called [AFMC 1998; AIIMS 1998; BHU 2002]
A.	Perkin's reaction
B.	Fittig's reaction
C.	Sandmeyer's reaction
D.	Liebermann's nitroso reaction
Answer» E.

Discussion

7177.	The strongest base among the following is [AIIMS 2004; BHU 2004]
A.
B.
C.
D.
Answer» D.

Discussion

7178.	If N and S are present in an organic compound during Lassaigne test, then both changes into [CPMT 1997]
A.	\[N{{a}_{2}}S\] and \[NaCN\]
B.	NaSCN
C.	\[N{{a}_{2}}S{{O}_{3}}\] and NaCN
D.	\[N{{a}_{2}}S\] and NaCNO
Answer» C. \[N{{a}_{2}}S{{O}_{3}}\] and NaCN

Discussion

7179.	\[RN{{H}_{2}}\] reacts with \[{{C}_{6}}{{H}_{5}}S{{O}_{2}}Cl\] in aqueous \[KOH\] to give a clear solution. On acidification a precipitate is obtained which is due to the formation of [Roorkee 2000]
A.	\[R-\underset{H\,\,\,}{\overset{H\,\,}{\mathop{\underset{\|\,\,\,\,}{\overset{\|\,\,\,\,}{\mathop{{{N}^{+}}}}}\,}}}\,-S{{O}_{2}}{{C}_{6}}{{H}_{5}}O{{H}^{-}}\]
B.	\[R-{{N}^{-}}S{{O}_{2}}{{C}_{6}}{{H}_{5}}{{K}^{+}}\]
C.	\[R-NHS{{O}_{2}}{{C}_{6}}{{H}_{5}}\]
D.	\[{{C}_{6}}{{H}_{5}}S{{O}_{2}}N{{H}_{2}}\]
Answer» D. \[{{C}_{6}}{{H}_{5}}S{{O}_{2}}N{{H}_{2}}\]

Discussion

7180.	The following reaction is [KCET 1996]
A.	Nucleophilic substitution
B.	Electrophilic substitution
C.	Free radical substitution
D.	None of these
Answer» B. Electrophilic substitution

Discussion

7181.	Order of basicity of ethyl amines is [MP PMT/PET 1988]
A.	Secondary > Primary > Tertiary
B.	Primary > Secondary > Tertiary
C.	Secondary > Tertiary > Primary
D.	Tertiary > Primary > Secondary
Answer» B. Primary > Secondary > Tertiary

Discussion

7182.	The refluxing of \[{{(C{{H}_{3}})}_{2}}NCOC{{H}_{3}}\] with acid gives [KCET 1996]
A.	\[2C{{H}_{3}}N{{H}_{2}}+C{{H}_{3}}COOH\]
B.	\[2C{{H}_{3}}OH+C{{H}_{3}}COOH\]
C.	\[{{(C{{H}_{3}})}_{2}}NH+C{{H}_{3}}COOH\]
D.	\[{{(C{{H}_{3}})}_{2}}NCOOH+C{{H}_{4}}\]
Answer» D. \[{{(C{{H}_{3}})}_{2}}NCOOH+C{{H}_{4}}\]

Discussion

7183.	The order of basic strength among the following amines in benzene solution is [AIIMS 1991; RPMT 2002]
A.	\[C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{3}}N>{{(C{{H}_{3}})}_{2}}NH\]
B.	\[{{(C{{H}_{3}})}_{2}}NH>C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{3}}N\]
C.	\[C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{2}}NH>{{(C{{H}_{3}})}_{3}}N\]
D.	\[{{(C{{H}_{3}})}_{3}}N>C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{2}}NH\]
Answer» C. \[C{{H}_{3}}N{{H}_{2}}>{{(C{{H}_{3}})}_{2}}NH>{{(C{{H}_{3}})}_{3}}N\]

Discussion

7184.	\[+\,CHC{{l}_{3}}+KOH\to ?\] [BHU 2000; Pb. PMT 2000; Kerala 2003]
A.	Phenyl isocyanide
B.	Benzyl amine
C.	Benzyl chloride
D.	None of these
Answer» B. Benzyl amine

Discussion

7185.	The compound Forms nitro so amines when the substituents are [Roorkee 1999]
A.	\[{{R}_{1}}=C{{H}_{3}},\,{{R}_{2}}={{R}_{3}}=H\]
B.	\[{{R}_{1}}={{R}_{2}}=H,\,\,{{R}_{3}}={{C}_{2}}{{H}_{5}}\]
C.	\[{{R}_{1}}=H,\,\,{{R}_{2}}={{R}_{3}}=C{{H}_{3}}\]
D.	\[{{R}_{1}}=C{{H}_{3}},\,\,{{R}_{2}}={{C}_{2}}{{H}_{5}},\,\,{{R}_{3}}=H\]
Answer» D. \[{{R}_{1}}=C{{H}_{3}},\,\,{{R}_{2}}={{C}_{2}}{{H}_{5}},\,\,{{R}_{3}}=H\]

Discussion

7186.	In the above reaction 'X' stands for [CPMT 1986, 2001; MP PET 1992; KCET (Engg./Med.) 2000]
A.	\[N{{H}_{2}}\]
B.	\[SnC{{l}_{2}}\]
C.	Cl
D.	\[NH_{4}^{+}C{{l}^{-}}\]
Answer» B. \[SnC{{l}_{2}}\]

Discussion

7187.	Which conformation of \[{{C}_{6}}{{H}_{6}}C{{l}_{6}}\] is most powerful insecticide
A.	aaeeee
B.	aaaeee
C.	aaaaee
D.	aaaaaa
Answer» C. aaaaee

Discussion

7188.	In which alkyl halide, \[S{{N}^{2}}\] mechanism is favoured maximum [RPMT 1997]
A.	\[C{{H}_{3}}Cl\]
B.	\[C{{H}_{3}}C{{H}_{2}}Cl\]
C.	\[{{(C{{H}_{3}})}_{2}}CHCl\]
D.	\[{{(C{{H}_{3}})}_{3}}C-Cl\]
Answer» B. \[C{{H}_{3}}C{{H}_{2}}Cl\]

Discussion

7189.	The hybridization state of carbon atoms in the product formed by the reaction of ethyl chloride with aqueous potassium hydroxide is [EAMCET 1997]
A.	sp
B.	\[s{{p}^{2}}\]
C.	\[s{{p}^{3}}\]
D.	\[s{{p}^{3}}d\]
Answer» D. \[s{{p}^{3}}d\]

Discussion

7190.	When but -3-en -2- ol reacts with aq. HBr, the product formed is [DCE 2001]
A.	3 - bromobut - 1- ene
B.	1 - bromobut - 2- ene
C.	A mixture of both a and b
D.	2 - bromobut - 2 - ene
Answer» D. 2 - bromobut - 2 - ene

Discussion

7191.	In which one of the following conversions phosphorus pentachloride is used as a reagent [EAMCET 1997]
A.	\[{{H}_{2}}C=C{{H}_{2}}\to C{{H}_{3}}C{{H}_{2}}Cl\]
B.	\[{{H}_{3}}C-O-C{{H}_{3}}\to C{{H}_{3}}Cl\]
C.	\[C{{H}_{3}}C{{H}_{2}}OH\to C{{H}_{3}}C{{H}_{2}}Cl\]
D.	\[HC\equiv CH\to C{{H}_{2}}=CHCl\]
Answer» C. \[C{{H}_{3}}C{{H}_{2}}OH\to C{{H}_{3}}C{{H}_{2}}Cl\]

Discussion

7192.	Which of the following is the example of \[S{{N}^{2}}\] reaction [CPMT 1999]
A.	\[C{{H}_{3}}Br+O{{H}^{-}}-C{{H}_{3}}OH+B{{r}^{-}}\]
B.	\[\underset{\underset{\,Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH\,\,\,}{\mathop{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\|\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{C{{H}_{3}}CHC{{H}_{3}}+O{{H}^{-}}\xrightarrow{{}}C{{H}_{3}}CHC{{H}_{3}}+B{{r}^{-}}}}\,\]
C.	\[C{{H}_{3}}C{{H}_{2}}OH\xrightarrow{-{{H}_{2}}O}C{{H}_{2}}=C{{H}_{2}}\]
D.	\[\underset{\underset{\,Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,H\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{\overset{\overset{C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{C{{H}_{3}}-C-C{{H}_{3}}+O{{H}^{-}}\to C{{H}_{3}}-C-O-C{{H}_{3}}+B{{r}^{-}}}}\,}}\,\]
Answer» B. \[\underset{\underset{\,Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH\,\,\,}{\mathop{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\|\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{C{{H}_{3}}CHC{{H}_{3}}+O{{H}^{-}}\xrightarrow{{}}C{{H}_{3}}CHC{{H}_{3}}+B{{r}^{-}}}}\,\]

Discussion

7193.	An isomer of \[{{C}_{3}}{{H}_{6}}C{{l}_{2}}\]on boiling with aqueous KOH gives acetone. Hence, the isomer is [UPSEAT 2000]
A.	2, 2-dichloropropane
B.	1, 2-dichloropropane
C.	1, 1-dichloropropane
D.	1, 3-dichloropropane
Answer» B. 1, 2-dichloropropane

Discussion

7194.	A new carbon-carbon bond formation is possible in [IIT-JEE 1998]
A.	Cannizzaro reaction
B.	Friedel-Craft's alkylation
C.	Clemmensen reduction
D.	Reimer-Tiemann reaction
Answer» C. Clemmensen reduction

Discussion

7195.	The odd decomposition of carbon chlorine bond form [UPSEAT 1999]
A.	Two free ions
B.	Two-carbanium ion
C.	Two carbanion
D.	A cation and an anion
Answer» E.

Discussion

7196.	When CHCl3 is boiled with NaOH, It gives [Orissa JEE 2003]
A.	Formic acid
B.	Trihydroxy methane
C.	Acetylene
D.	Sodium formate
Answer» C. Acetylene

Discussion

7197.	Among the following, the molecule with the highest dipole moment is [IIT-JEE (Screening) 2003]
A.	\[C{{H}_{3}}Cl\]
B.	\[C{{H}_{2}}C{{l}_{2}}\]
C.	\[CHC{{l}_{3}}\]
D.	\[CC{{l}_{4}}\]
Answer» B. \[C{{H}_{2}}C{{l}_{2}}\]

Discussion

7198.	The oxidation potential of a hydrogen electrode at pH = 10 and \[p{{H}_{1}}=1\] [JIPMER 2000]
A.	0.059 V
B.	0.59 V
C.	0.00 V
D.	0.51 V
Answer» C. 0.00 V

Discussion

7199.	A gas \[X\] at \[1\,atm\] is bubbled through a solution containing a mixture of \[1\,M\,{{Y}^{-}}\] and \[1\,M\,{{Z}^{-}}\] at \[{{25}^{o}}C\]. If the reduction potential of \[Z>Y>X\], then [IIT 1999]
A.	\[Y\] will oxidize \[X\] and not \[Z\]
B.	\[Y\] will oxidize \[Z\] and not \[X\]
C.	\[Y\] will oxidize both \[X\] and \[Z\]
D.	\[Y\] will reduce both \[X\] and \[Z\]
Answer» B. \[Y\] will oxidize \[Z\] and not \[X\]

Discussion

7200.	The standard \[EMF\] for the given cell reaction \[Zn+C{{u}^{2+}}=Cu+Z{{n}^{2+}}\] is \[1.10V\] at \[{{25}^{o}}C\]. The \[EMF\] for the cell reaction, when \[0.1M\,C{{u}^{2+}}\] and \[0.1M\,Z{{n}^{2+}}\] solutions are used, at \[{{25}^{o}}C\] is [MNR 1994; AMU 1999; UPSEAT 2002]
A.	\[1.10\,V\]
B.	\[0.110\,V\]
C.	\[-1.10\,V\]
D.	\[-\,0.110\,V\]
Answer» B. \[0.110\,V\]

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

Froth floatation process is used for concentration of [MNR 1987; IIT 1989; UPSEAT 2000, 02]

'Lapis-Lazuli' is a blue coloured precious stone. It is mineral of the class [NCERT 1980; AIIMS 1980; BHU 1978, 80]

Which is correct [MADT Bihar 1995]

Black Jack is an ore of [PCET 2004]

Which one of the following can be used as monomer in a polymerisation reaction [MP PMT 1993]

Styrene at room temparature is

Perlon is [AFMC 2001]

High density polyethylene (HDPE) can be prepared from ethylene by

In the manufacture of polythene by the Ziegler process using ethylene, the temperature for proper polymerisation required is

Polymer used in bullet proof glass is [MP PET 2004]

Ebonite is [CBSE PMT 2000]

?Celanese silk? is

Which of the following is a chain growth polymer [CBSE PMT 2004]

Which of the following statement is correct regarding the drawbacks of raw rubber [AIIMS 2001]

Wash and wear clothes are manufactured using

Trans-form of polyisoprene is

p-chloroaniline and anilinium hydrochloride can be distinguished by [IIT-JEE 1998]

Aniline reacts with acetaldehyde to form [MHCET 2004; AFMC 2004]

Which of the following would be most reactive towards nitration [AMU 2000; UPSEAT 2002]

The correct order of basicity?s of the following compounds is \[\underset{4}{\mathop{C{{H}_{3}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}}}\,\] [IIT-JEE (Screening) 2001]

The following compound on hydrolysis in aqueous acetone will give

Which of the following is the strongest base ? [AIEEE 2004]

The structural formula of Indigo dye is : [DPMT 2004]

Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be [CBSE PMT 2004]

A primary amine is formed an amide by the treatment of bromine and alkali. The primary amine has : [BHU 2004]

Nitroso amines \[({{R}_{2}}N-N=O)\] are soluble in water. On heating them with concentrated \[{{H}_{2}}S{{O}_{4}}\] they give secondary amines. The reaction is called [AFMC 1998; AIIMS 1998; BHU 2002]

The strongest base among the following is [AIIMS 2004; BHU 2004]

If N and S are present in an organic compound during Lassaigne test, then both changes into [CPMT 1997]

\[RN{{H}_{2}}\] reacts with \[{{C}_{6}}{{H}_{5}}S{{O}_{2}}Cl\] in aqueous \[KOH\] to give a clear solution. On acidification a precipitate is obtained which is due to the formation of [Roorkee 2000]

The following reaction is [KCET 1996]

Order of basicity of ethyl amines is [MP PMT/PET 1988]

The refluxing of \[{{(C{{H}_{3}})}_{2}}NCOC{{H}_{3}}\] with acid gives [KCET 1996]

The order of basic strength among the following amines in benzene solution is [AIIMS 1991; RPMT 2002]

\[+\,CHC{{l}_{3}}+KOH\to ?\] [BHU 2000; Pb. PMT 2000; Kerala 2003]

The compound Forms nitro so amines when the substituents are [Roorkee 1999]

In the above reaction 'X' stands for [CPMT 1986, 2001; MP PET 1992; KCET (Engg./Med.) 2000]

Which conformation of \[{{C}_{6}}{{H}_{6}}C{{l}_{6}}\] is most powerful insecticide

In which alkyl halide, \[S{{N}^{2}}\] mechanism is favoured maximum [RPMT 1997]

The hybridization state of carbon atoms in the product formed by the reaction of ethyl chloride with aqueous potassium hydroxide is [EAMCET 1997]

When but -3-en -2- ol reacts with aq. HBr, the product formed is [DCE 2001]

In which one of the following conversions phosphorus pentachloride is used as a reagent [EAMCET 1997]

Which of the following is the example of \[S{{N}^{2}}\] reaction [CPMT 1999]

An isomer of \[{{C}_{3}}{{H}_{6}}C{{l}_{2}}\]on boiling with aqueous KOH gives acetone. Hence, the isomer is [UPSEAT 2000]

A new carbon-carbon bond formation is possible in [IIT-JEE 1998]

The odd decomposition of carbon chlorine bond form [UPSEAT 1999]

When CHCl3 is boiled with NaOH, It gives [Orissa JEE 2003]

Among the following, the molecule with the highest dipole moment is [IIT-JEE (Screening) 2003]

The oxidation potential of a hydrogen electrode at pH = 10 and \[p{{H}_{1}}=1\] [JIPMER 2000]

A gas \[X\] at \[1\,atm\] is bubbled through a solution containing a mixture of \[1\,M\,{{Y}^{-}}\] and \[1\,M\,{{Z}^{-}}\] at \[{{25}^{o}}C\]. If the reduction potential of \[Z>Y>X\], then [IIT 1999]

The standard \[EMF\] for the given cell reaction \[Zn+C{{u}^{2+}}=Cu+Z{{n}^{2+}}\] is \[1.10V\] at \[{{25}^{o}}C\]. The \[EMF\] for the cell reaction, when \[0.1M\,C{{u}^{2+}}\] and \[0.1M\,Z{{n}^{2+}}\] solutions are used, at \[{{25}^{o}}C\] is [MNR 1994; AMU 1999; UPSEAT 2002]