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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 1951. |
Dehydrohalogenation in monohaloalkanes produces |
| A. | A single bond |
| B. | A double bond |
| C. | A triple bond |
| D. | Fragmentation |
| Answer» C. A triple bond | |
| 1952. |
Which of the following reacts with phenol to give salicylaldehyde after hydrolysis [MP PMT 1995] |
| A. | Dichloromethane |
| B. | Trichloromethane |
| C. | Methyl chloride |
| D. | None of these |
| Answer» C. Methyl chloride | |
| 1953. |
Iodoform is formed on warming \[{{I}_{2}}\] and NaOH with [MP PET 1995; DCE 1999; RPET 1999; RPMT 2002] |
| A. | \[{{C}_{2}}{{H}_{5}}OH\] |
| B. | \[C{{H}_{3}}OH\] |
| C. | HCOOH |
| D. | \[{{C}_{6}}{{H}_{6}}\] |
| Answer» B. \[C{{H}_{3}}OH\] | |
| 1954. |
In the above reaction product is |
| A. | \[{{C}_{6}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}\] |
| C. | \[{{C}_{6}}{{H}_{5}}O{{C}_{6}}{{H}_{5}}\] |
| D. | \[{{C}_{6}}{{H}_{5}}I\] |
| Answer» B. \[{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}\] | |
| 1955. |
A compound X on reaction with chloroform and NaOH gives a compound with a very unpleasant odour. X is [MP PMT 1999] |
| A. | \[{{C}_{6}}{{H}_{5}}CON{{H}_{2}}\] |
| B. | \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\] |
| C. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}NHC{{H}_{3}}\] |
| D. | \[{{C}_{6}}{{H}_{5}}NHC{{H}_{3}}\] |
| Answer» C. \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}NHC{{H}_{3}}\] | |
| 1956. |
Following equation illustrates \[{{C}_{6}}{{H}_{5}}Cl+2NaOH\underset{200\,atm}{\mathop{\xrightarrow{200-{{250}^{o}}C}}}\,{{C}_{6}}{{H}_{5}}ONa+NaCl+{{H}_{2}}O\] [Bihar CEE 1995] |
| A. | Dow's process |
| B. | Kolbe's process |
| C. | Carbylamine test |
| D. | Haloform reaction |
| Answer» B. Kolbe's process | |
| 1957. |
A compound A has a molecular formula \[{{C}_{2}}C{{l}_{3}}OH.\] It reduces Fehling solution and on oxidation gives a monocarboxylic acid B. A is obtained by action of chlorine on ethyl alcohol. A is [CBSE PMT 1994; MP PET 1997; KCET 2005] |
| A. | Chloral |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{3}}Cl\] |
| D. | Chloroacetic acid |
| Answer» B. \[CHC{{l}_{3}}\] | |
| 1958. |
An organic halide is shaken with aqueous \[NaOH\] followed by the addition of dil. \[HN{{O}_{3}}\] and silver nitrate solution gave white ppt. The substance can be [JIPMER 1997] |
| A. | \[{{C}_{6}}{{H}_{4}}(C{{H}_{3}})Br\] |
| B. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}Cl\] |
| C. | \[{{C}_{6}}{{H}_{5}}Cl\] |
| D. | None of these |
| Answer» C. \[{{C}_{6}}{{H}_{5}}Cl\] | |
| 1959. |
\[2CHC{{l}_{3}}+{{O}_{2}}\xrightarrow{X}2COC{{l}_{2}}+2HCl\] In the above reaction, X stands for [CPMT 1985] |
| A. | An oxidant |
| B. | A reductant |
| C. | Light and air |
| D. | None of these |
| Answer» D. None of these | |
| 1960. |
When chloroform is exposed to air and sunlight, it gives [NCERT 1984; CPMT 1978, 87; CBSE PMT 1990; EAMCET 1993; MNR 1994; MP PET 1997, 2000; BHU 2001; AFMC 2002] |
| A. | Carbon tetrachloride |
| B. | Carbonyl chloride |
| C. | Mustard gas |
| D. | Lewsite |
| Answer» C. Mustard gas | |
| 1961. |
Ethyl chloride on heating with silver cyanide forms a compound X. The functional isomer of X is [EAMCET 1997; KCET 2005] |
| A. | \[{{C}_{2}}{{H}_{5}}NC\] |
| B. | \[{{C}_{2}}{{H}_{5}}CN\] |
| C. | \[{{H}_{3}}C-NH-C{{H}_{3}}\] |
| D. | \[{{C}_{2}}{{H}_{5}}N{{H}_{2}}\] |
| Answer» C. \[{{H}_{3}}C-NH-C{{H}_{3}}\] | |
| 1962. |
Chlorobenzene on fusing with solid NaOH gives [DPMT 1981; CPMT 1990] |
| A. | Benzene |
| B. | Benzoic acid |
| C. | Phenol |
| D. | Benzene chloride |
| Answer» D. Benzene chloride | |
| 1963. |
When phenol reacts with \[CHC{{l}_{3}}\] and KOH, the product obtained would be [RPMT 1997] |
| A. | Salicylaldehyde |
| B. | p-hydroxy benzaldehyde |
| C. | Both A and B |
| D. | Chloretone |
| Answer» D. Chloretone | |
| 1964. |
Which of the following reactions gives \[{{H}_{2}}C=C=C=C{{H}_{2}}\] [Roorkee Qualifying 1998] |
| A. | \[C{{H}_{2}}Br-CBr=C{{H}_{2}}\xrightarrow{Zn/C{{h}_{3}}OH}\] |
| B. | \[HC\equiv C-C{{H}_{2}}-COOH\underset{{{40}^{o}}C}{\mathop{\xrightarrow{Aq.{{K}_{2}}C{{O}_{3}}}}}\,\] |
| C. | \[C{{H}_{2}}Br-C\equiv C-C{{H}_{2}}Br\underset{\text{Heat}}{\mathop{\xrightarrow{Zn}}}\,\] |
| D. | \[2C{{H}_{2}}=CH-C{{H}_{2}}I\underset{{}}{\mathop{\xrightarrow{{}}}}\,\] |
| Answer» D. \[2C{{H}_{2}}=CH-C{{H}_{2}}I\underset{{}}{\mathop{\xrightarrow{{}}}}\,\] | |
| 1965. |
1-chlorobutane reacts with alcoholic KOH to form [IIT-JEE 1991; AFMC 1998] |
| A. | 1-butene |
| B. | 2-butane |
| C. | 1-butanol |
| D. | 2-butanol |
| Answer» B. 2-butane | |
| 1966. |
Treatment of ammonia with excess of ethyl chloride will yield [AIIMS 1992] |
| A. | Diethyl amine |
| B. | Ethane |
| C. | Tetraethyl ammonium chloride |
| D. | Methyl amine |
| Answer» D. Methyl amine | |
| 1967. |
\[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}Br+KOH\text{ (alc}\text{.)}\to \text{Product}\] Product in above reaction is [RPMT 2003] |
| A. | \[C{{H}_{3}}-CH=C{{H}_{2}}\] |
| B. | \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{3}}\] |
| C. | A and B both |
| D. | None of these |
| Answer» B. \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{3}}\] | |
| 1968. |
Iodoform heated with Ag powder to form [DPMT 1985] |
| A. | Acetylene |
| B. | Ethylene |
| C. | Methane |
| D. | Ethane |
| Answer» B. Ethylene | |
| 1969. |
Ethyl bromide reacts with silver nitrite to form [DPMT 1985; IIT-JEE 1991] |
| A. | Nitroethane |
| B. | Nitroethane and ethyl nitrite |
| C. | Ethyl nitrite |
| D. | Ethane |
| Answer» B. Nitroethane and ethyl nitrite | |
| 1970. |
Ethyl bromide reacts with lead-sodium alloy to form [MP PMT/PET 1988; MP PET 1997] |
| A. | Tetraethyl lead |
| B. | Tetraethyl bromide |
| C. | Both A and B |
| D. | None of the above |
| Answer» B. Tetraethyl bromide | |
| 1971. |
On heating \[CHC{{l}_{3}}\] with aq. NaOH, the product is [CPMT 1971, 78; BHU 1997; EAMCET 1998; JIPMER (Med.) 2002] |
| A. | \[C{{H}_{3}}COONa\] |
| B. | \[HCOONa\] |
| C. | Sodium oxalate |
| D. | \[C{{H}_{3}}OH\] |
| Answer» C. Sodium oxalate | |
| 1972. |
Which of the following statements about chloroform is false [Manipal MEE 1995] |
| A. | It is a colourless, sweet-smelling liquid |
| B. | It is almost insoluble in water |
| C. | It is highly inflammable |
| D. | It can be used as an inhalational anaesthetic agent |
| Answer» D. It can be used as an inhalational anaesthetic agent | |
| 1973. |
Benzyl chloride when oxidised by \[pb{{(N{{O}_{3}})}_{2}}\] gives [MP PMT 1989] |
| A. | Benzoic acid |
| B. | Benzaldehyde |
| C. | Benzene |
| D. | None |
| Answer» C. Benzene | |
| 1974. |
Reaction of ethyl chloride with sodium leads to [NCERT 1984] |
| A. | Ethane |
| B. | Propane |
| C. | n-butane |
| D. | n-pentane |
| Answer» D. n-pentane | |
| 1975. |
Ethylene difluoride on hydrolysis gives |
| A. | Glycol |
| B. | Fluoroethanol |
| C. | Difluoroethanol |
| D. | Freon |
| Answer» B. Fluoroethanol | |
| 1976. |
The dehydrobromination of 2-bromobutane gives \[C{{H}_{3}}CH=CHC{{H}_{3}}.\] The product is |
| A. | Hofmann product |
| B. | Saytzeff product |
| C. | Hoffmann-Saytzeff product |
| D. | Markownikoff product |
| Answer» C. Hoffmann-Saytzeff product | |
| 1977. |
In presence of \[AlC{{l}_{3}},\] benzene and n-propyl bromide react in Friedal-Craft's reaction to form [MP PMT 1991] |
| A. | n-propyl benzene |
| B. | 1, 2-dinormal propyl benzene |
| C. | 1, 4-dinormal propyl benzene |
| D. | Isopropyl benzene |
| Answer» E. | |
| 1978. |
Reaction \[{{C}_{2}}{{H}_{5}}I+{{C}_{5}}{{H}_{11}}I+2Na\to {{C}_{2}}{{H}_{5}}-{{C}_{5}}{{H}_{11}}+2NaI\] is called [MP PMT 1992] |
| A. | Hoffmann's reaction |
| B. | Dow's reaction |
| C. | Wurtz's reaction |
| D. | Riemer-Tiemann's reaction |
| Answer» D. Riemer-Tiemann's reaction | |
| 1979. |
Ethylidene chloride on treatment with aqueous KOH gives [MP PMT 1986] |
| A. | Ethylene glycol |
| B. | Acetaldehyde |
| C. | Formaldehyde |
| D. | None |
| Answer» C. Formaldehyde | |
| 1980. |
\[{{C}_{6}}{{H}_{5}}C{{H}_{2}}Cl+KCN(aq.)\to X+Y\] Compounds X and Y are [BHU 1979] |
| A. | \[{{C}_{6}}{{H}_{6}}+KCl\] |
| B. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}CN+KCl\] |
| C. | \[{{C}_{6}}{{H}_{5}}C{{H}_{3}}+KCl\] |
| D. | None of these |
| Answer» C. \[{{C}_{6}}{{H}_{5}}C{{H}_{3}}+KCl\] | |
| 1981. |
If we use pyrene \[(CC{{l}_{4}})\] in the Riemer-Tiemann reaction in place of chloroform, the product formed is [CBSE PMT 1989; MP PMT 1990; MH CET 1999] |
| A. | Salicylaldehyde |
| B. | Phenolphthalein |
| C. | Salicylic acid |
| D. | Cyclohexanol |
| Answer» D. Cyclohexanol | |
| 1982. |
War gas is formed from [BHU 1995] |
| A. | \[P{{H}_{3}}\] |
| B. | \[{{C}_{2}}{{H}_{2}}\] |
| C. | Zinc phosphate |
| D. | Chloropicrin |
| Answer» E. | |
| 1983. |
Reaction of t-butyl bromide with sodium methoxide produces [CBSE PMT 1994] |
| A. | Isobutane |
| B. | Isobutylene |
| C. | Sodium t-butoxide |
| D. | t-butyl methyl ether |
| Answer» C. Sodium t-butoxide | |
| 1984. |
Grignard reagent is prepared by the reaction between [CBSE PMT 1994; DPMT 1996; Pb. PMT 1999; MH CET 1999] |
| A. | Zinc and alkyl halide |
| B. | Magnesium and alkyl halide |
| C. | Magnesium and alkane |
| D. | Magnesium and aromatic hydrocarbon |
| Answer» C. Magnesium and alkane | |
| 1985. |
Salicylic acid can be prepared using Reimer-Tiemann's reaction by treating phenol with [KCET 1989] |
| A. | Methyl chloride in the presence of anhydrous aluminium chloride |
| B. | Carbon dioxide under pressure in sodium hydroxide solution |
| C. | Carbon tetrachloride and concentrated sodium hydroxide |
| D. | Sodium nitrite and a few drops of concentrated sulphuric acid |
| Answer» D. Sodium nitrite and a few drops of concentrated sulphuric acid | |
| 1986. |
Analyse the following reaction and identify the nature of \[A\] and \[B\] [Kerala CET 2005] \[B\underset{hv}{\mathop{\xleftarrow{HBr}}}\,\] \[\xrightarrow{HBr}A\] |
| A. | Both A and B are |
| B. | Both A and B are |
| C. | A is & B is |
| D. | A is & B is |
| E. | A is & B is |
| Answer» D. A is & B is | |
| 1987. |
Which of the following compound will make precipitate most readily with \[AgN{{O}_{3}}\] [CPMT 1992] |
| A. | \[CC{{l}_{3}}CHO\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}Cl\] |
| D. | \[CH{{I}_{3}}\] |
| Answer» E. | |
| 1988. |
Grignard reagent adds to [KCET 2005] |
| A. | \[>C=O\] |
| B. | \[-C\equiv N\] |
| C. | \[>C=S\] |
| D. | All of the above |
| Answer» E. | |
| 1989. |
Which of the following haloalkanes is most reactive [KCET 2005] |
| A. | 1-chloropropane |
| B. | 1-bromopropane |
| C. | 2-chloropropane |
| D. | 2-bromopropane |
| Answer» E. | |
| 1990. |
Alkyl halides react with dialkyl copper reagents to give [AIEEE 2005] |
| A. | Alkenes |
| B. | Alkyl copper halides |
| C. | Alkanes |
| D. | Alkenyl halides |
| Answer» D. Alkenyl halides | |
| 1991. |
When phenyl magnesium bromide reacts with t-butanol, the product would be [IIT 2005] |
| A. | Benzene |
| B. | Phenol |
| C. | t-butyl benzene |
| D. | t-butyl phenyl ether |
| Answer» B. Phenol | |
| 1992. |
The reactivities of methyl chloride, propyl chloride and chlorobenzene are in the order [KCET 1988] |
| A. | Methyl chloride > propyl chloride > chlorobenzene |
| B. | Propyl chloride > methyl chloride > chlorobenzene |
| C. | Methyl chloride > chlorobenzene > propyl chloride |
| D. | Chlorobenzene > propyl chloride > methyl chloride |
| Answer» B. Propyl chloride > methyl chloride > chlorobenzene | |
| 1993. |
The major product formed in the following reaction is \[\underset{H}{\overset{\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{C{{H}_{3}}-\underset{|}{\overset{|}{\mathop{C}}}\,-C{{H}_{2}}}}}\,\ Br\ \ \underset{C{{H}_{3}}OH}{\mathop{\xrightarrow{C{{H}_{3}}O}}}\,\] [AIIMS 2005] |
| A. | \[\underset{H}{\overset{\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{C{{H}_{3}}-\underset{|}{\overset{|}{\mathop{C}}}\,-C{{H}_{2}}}}}\,OC{{H}_{3}}\] |
| B. | \[C{{H}_{3}}\underset{\,\,\,\,\,OC{{H}_{3}}}{\mathop{-\underset{|}{\mathop{C}}\,H-}}\,C{{H}_{2}}\ C{{H}_{3}}\] |
| C. | \[\overset{\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{C{{H}_{3}}-\overset{|}{\mathop{C}}\,=C{{H}_{2}}}}\,\] |
| D. | \[\underset{\,\,\,\,\,\,\,\,\,\,\,OC{{H}_{3}}}{\overset{\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{C{{H}_{3}}-\underset{|}{\overset{|}{\mathop{C}}}\,-C{{H}_{3}}}}}\,\] |
| Answer» E. | |
| 1994. |
Alkyl halide can be converted into alkene by [BCECE 2005] |
| A. | Nucleophilic substitution reaction |
| B. | Elimination reaction |
| C. | Both nucleophilic substitution and elimination reaction |
| D. | Rearrangement |
| Answer» C. Both nucleophilic substitution and elimination reaction | |
| 1995. |
Which of the following statements is incorrect regarding benzyl chloride [KCET 2003] |
| A. | It gives white precipitate with alcoholic \[AgN{{O}_{3}}\] |
| B. | It is an aromatic compound with substitution in the side chain |
| C. | It undergoes nucleophilic substitution reaction |
| D. | It is less reactive than vinyl chloride |
| Answer» E. | |
| 1996. |
Bottles containing \[{{C}_{6}}{{H}_{5}}I\] and \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}I\]lost their original labels. They were labelled A and B for testing. A and B were separately taken in test tubes and boiled with \[NaOH\]solution. The end solution in each tube was made acidic with dilute \[HN{{O}_{3}}\]and then some \[AgN{{O}_{3}}\] solution was added. Substance B give a yellow precipitate. Which one of the following statements is true for this experiment [AIEEE 2003] |
| A. | A was \[{{C}_{6}}{{H}_{5}}I\] |
| B. | A was \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}I\] |
| C. | B was \[{{C}_{6}}{{H}_{5}}I\] |
| D. | Addition of \[HN{{O}_{3}}\]was unnecessary |
| Answer» B. A was \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}I\] | |
| 1997. |
Why is chloroform put into dark coloured bottles [MP PET 2002] |
| A. | To prevent evaporation |
| B. | To prevent from moisture |
| C. | To prevent it from oxidation to form phosgene |
| D. | To prevent its reaction with glass |
| Answer» D. To prevent its reaction with glass | |
| 1998. |
Which of the following is boiled with ethyl chloride to form ethyl alcohol [MNR 1982] |
| A. | Alcoholic KOH |
| B. | Aqueous KOH |
| C. | \[{{H}_{2}}O\] |
| D. | \[{{H}_{2}}{{O}_{2}}\] |
| Answer» C. \[{{H}_{2}}O\] | |
| 1999. |
An alkyl bromide (X) reacts with Na to form 4, 5-diethyloctane. Compound X is [Roorkee 1999] |
| A. | \[C{{H}_{3}}{{(C{{H}_{2}})}_{3}}Br\] |
| B. | \[C{{H}_{3}}{{(C{{H}_{2}})}_{5}}Br\] |
| C. | \[C{{H}_{3}}{{(C{{H}_{2}})}_{3}}CH.Br.C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}{{(C{{H}_{2}})}_{2}}CH.Br.C{{H}_{2}}C{{H}_{3}}\] |
| Answer» E. | |
| 2000. |
In the following reaction X is \[C{{H}_{3}}N{{H}_{2}}+X+KOH\to C{{H}_{3}}NC\,\,\text{(highly offensive odour)}\] [MP PET 1994] |
| A. | \[C{{H}_{2}}C{{l}_{2}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{3}}Cl\] |
| D. | \[CC{{l}_{4}}\] |
| Answer» C. \[C{{H}_{3}}Cl\] | |