Name two reagents which can be used to distinguish between ethene and ethyne.

Name two reagents which can be used to distinguish between ethene and ethyne.
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Ans. Tollen‘s reagent
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Which of the following statements about ethene, C2H4, is incorrect? (a) The H–C–H bond angles are approximately 109.5°. (b) There is a total of five sigma bonds. (c) The carbon atoms are sp2 hybridized. (d) The H–C–H bond angles are approximately 120°.

Description : Which of the following statements about ethene, C2H4, is incorrect? (a) The H–C–H bond angles are approximately 109.5°. (b) There is a total of five sigma bonds. (c) The carbon atoms are sp2 hybridized. (d) The H–C–H bond angles are approximately 120°.

Last Answer : The H–C–H bond angles are approximately 109.5°.

Which of the following is capable of exhibiting cis-trans isomerism? (a) 1-butene (b) 1-pentene (c) ethene (d) 2-butene

Description : Which of the following is capable of exhibiting cis-trans isomerism? (a) 1-butene (b) 1-pentene (c) ethene (d) 2-butene

Last Answer : 2-butene

What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-carbon σ bond in ethyne? (a) sp3–sp3 (b) sp2–sp2 (c) s–s (d) sp–sp

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Ethanoic acid is commonly called - (1) Acetic acid (2) Sulphuric acid (3) Sodium Ethoxide (4) Ethyne

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Explain why ethyne molecule is linear?

Description : Explain why ethyne molecule is linear?

Last Answer : Ans It is because each carbon atom in ethyne is sp hybridized

Acetic acid undergoes reduction with LiAlH4 to give (a) Ethanol (b) Ethane (c) Ethanal (d) Ethyne

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Last Answer : Ethanol

What is the formula for ethyne?

Description : What is the formula for ethyne? 

Last Answer : ANSWER: C2H2

Classify the following into saturated and unsaturated hydrocarbons – Benzene, cyclopropane, alkene and alkane, methane, ethene, Propyne, butene

Description : Classify the following into saturated and unsaturated hydrocarbons – Benzene, cyclopropane, alkene and alkane, methane, ethene, Propyne, butene

Last Answer : Saturated: Alkane, cyclopropane, methane Unsaturated: Benzene, alkene, ethene, Propyne, butene

Give reason: Ethene is said to be unsaturated.

Description : Give reason: Ethene is said to be unsaturated.

Last Answer : Ethene is said to be unsaturated because each molecule does have carbon-to-carbon double bond and has less maximum possible number of hydrogen atoms.

How is benzene prepared from ethyne?

Description : How is benzene prepared from ethyne?

Last Answer : What is the answer ?

What do you observe when ethyne is passed through ammoniacal cuprous chloride solution?

Description : What do you observe when ethyne is passed through ammoniacal cuprous chloride solution?

Last Answer : A red-brown precipitate of copper acetylide is formed.

Classify the following compounds containing double bond and triple bond – Ethyne, benzene, Butyne, pentene

Description : Classify the following compounds containing double bond and triple bond – Ethyne, benzene, Butyne, pentene

Last Answer : Double bond: Benzene, pentene Triple bond: Ethyne, Butyne

(4) None of these Explanation: Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. A catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts.

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Last Answer : Table salt gets moist during rainy season because – (1) sodium chloride is hygroscopic (2) sodium chloride is deliquescent (3) sodium chloride contains some quantity of sodium iodide (4) sodium chloride contains hygroscopic impurities like magnesium chloride

Why are Grignard reagents soluble in ether but not in benzene ?

Description : Why are Grignard reagents soluble in ether but not in benzene ? 

Last Answer : Ans. Grignard reagents from co-ordination complexes with ether but not benzene since the former has lone pair of electrons but the later does not.

. Which of the following reagents will react with furan to form 2-furansulfonic acid? (a) SO3 in pyridine at 100°C (b) Dilute H2SO4 at 200°C (c) SO2 at 100°C (d) Dilute H2SO4 at 100°C

Description : Which of the following reagents will react with furan to form 2-furansulfonic acid? (a) SO3 in pyridine at 100°C (b) Dilute H2SO4 at 200°C (c) SO2 at 100°C (d) Dilute H2SO4 at 100°C

Last Answer : SO3 in pyridine at 100°C

Which of the following reagents will react with pyrrole to form 2- formylpyrrole? (a) HCOOH (b) CHCl3/KOH (c) H2O2 (d) (CH3CO)2O/SnCl4

Description : Which of the following reagents will react with pyrrole to form 2- formylpyrrole? (a) HCOOH (b) CHCl3/KOH (c) H2O2 (d) (CH3CO)2O/SnCl4

Last Answer : CHCl3/KOH

Which of the following reagents is used to prepare benzenediazoniumchloride from aniline?(a) NaNO2 + HCl(b) LiAlH4(c) NH2NH2 + KOH(d) NaOH

Description : Which of the following reagents is used to prepare benzenediazonium chloride from aniline? (a) NaNO2 + HCl (b) LiAlH4 (c) NH2NH2 + KOH (d) NaOH

Last Answer : NaNO2 + HCl

Which of the following reagents does not react with aniline? (a) Acetyl chloride (b) Acetic anhydride (c) Ammonia (d) Nitrous acid

Description : Which of the following reagents does not react with aniline? (a) Acetyl chloride (b) Acetic anhydride (c) Ammonia (d) Nitrous acid

Last Answer : Ammonia

Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH

Description : Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH

Last Answer : Benzene + Br2/FeBr3

Which of the following reagents is most suitable for preparing chlorobenzene from benzene? (a) Aqueous chlorine (b) Chlorine in the presence of ultraviolet light (c) Chlorine in acetic acid (d) Chlorine in the presence of FeCl3

Description : Which of the following reagents is most suitable for preparing chlorobenzene from benzene? (a) Aqueous chlorine (b) Chlorine in the presence of ultraviolet light (c) Chlorine in acetic acid (d) Chlorine in the presence of FeCl3

Last Answer : Chlorine in the presence of FeCl3

Which of the following reagents will react with methyl group rather than thebenzene ring in methylbenzene?(a) Chlorine in the presence of uv light(b) CH3Cl in the presence of AlCl3(c) CH3COCl in the presence of AlCl3(d) Hydrogen in the presence of nickel

Description : Which of the following reagents will react with methyl group rather than the benzene ring in methylbenzene? (a) Chlorine in the presence of uv light (b) CH3Cl in the presence of AlCl3 (c) CH3COCl in the presence of AlCl3 (d) Hydrogen in the presence of nickel

Last Answer : Chlorine in the presence of uv light