ECAT Pre Engineering Chemistry Chapter 21 online mcq test with answers for chapter 21 (Alkyl Halides)

ECAT Chemistry Chapter 21 Alkyl Halides Online Test

Sr. #	Questions	Answers Choice
1	SN2 reaction can be best carried out with	Primary alkyl halides Secondary alkyl halides Tertiary alkyl halides All the three
2	Grignad reagent is reactive due to	The presence of halogen atom The presence of Mg atom The polarity of C - Mg bond None of above
3	When carbon dioxide is passed through the R - Mg - X is produced	Any carboxylic acid Propanoic acid Propanedioic acid None of these
4	The reactivity order of alkyl halides for a paricular alkyl group is	Fluoride > chloride > bromide > iodide Chloride > bromide > fluoride > iodide Iodide > bromide > chloride > fluoride Bromide > iodide > chloride > fluoride
5	An electrophile may be	Positive Negative Neutral Both c and a
6	Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of	Alcohol Water Suephuric acid Dry ether
7	Which is a weak nucleophile	OH<sup>-</sup> Br<sup>-</sup> NH<sub>3</sub> CI<sup>-</sup>
8	Which of the followings is not a nulceophile	OH<sup>-</sup> NH<sub>3</sub> C<sub>2</sub>H<sub>5</sub>O<sup>-</sup> Br<sub>2</sub>
9	The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is	Iodide > bromide > chloride Chloride > bromide > iodide Bromide > chloride > iodide Bromide > iodide > chloride
10	Which bond is most stable	C - Cl C - F C - Br C - I
11	With the increase in size of halogen atom the reactivity of an alkyl halide	Increases Decreases Remain constant None of these
12	When an alcohol reacts with SOCI₂an alkyl halide is formed. What are two other products	SO<sub>2</sub>and HCI SI<sub>2</sub>and H<sub>2</sub>O HCI and H<sub>2</sub>O H<sub>2</sub>S and HCI
13		2-bromo-3-methylbutane 3-methyl-2-bromobutane 2-methyl-3-bromobutane All of these
14		Primary alkyl halide Secondary alkyl halide Tertiary alkyl halide None of these
15	In a primary alkyl halide, the halogen atom is attached to a carbon which is further attached to	Only one carbon atom Two carbon atoms Three carbon atoms one or no carbon atom

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