{"id":89944,"date":"2025-06-01T10:17:42","date_gmt":"2025-06-01T10:17:42","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89944"},"modified":"2025-06-01T10:17:42","modified_gmt":"2025-06-01T10:17:42","slug":"which-one-of-the-following-compounds-is-not-considered-an-acid","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-not-considered-an-acid\/","title":{"rendered":"Which one of the following compounds is NOT considered an acid ?"},"content":{"rendered":"

Which one of the following compounds is NOT considered an acid ?<\/p>\n

[amp_mcq option1=”BF\u2083” option2=”AlCl\u2083” option3=”NH\u2083” option4=”C\u2086H\u2085OH” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2015<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nA) BF\u2083 (Boron Trifluoride) is a Lewis acid because the Boron atom has an incomplete octet and can accept an electron pair.
\nB) AlCl\u2083 (Aluminum Chloride) is also a Lewis acid as the Aluminum atom has an incomplete octet and can accept an electron pair.
\nC) NH\u2083 (Ammonia) is a Br\u00f8nsted-Lowry base because it can accept a proton (H\u207a) to form ammonium ion (NH\u2084\u207a). It is also a Lewis base because the nitrogen atom has a lone pair of electrons that it can donate. It is not considered an acid in standard definitions.
\nD) C\u2086H\u2085OH (Phenol) is a weak acid because the hydroxyl group (-OH) attached to the benzene ring can donate a proton, forming the phenoxide ion. The acidity is enhanced by the stability of the phenoxide ion through resonance.
\nTherefore, NH\u2083 is the compound that is NOT considered an acid; it is a base.
\n<\/section>\n
Acids can be defined in various ways (Arrhenius, Br\u00f8nsted-Lowry, Lewis). Br\u00f8nsted-Lowry acids are proton donors. Lewis acids are electron pair acceptors. Bases are proton acceptors (Br\u00f8nsted-Lowry) or electron pair donors (Lewis). Ammonia is a common example of a base.
\n<\/section>\n
Lewis acidity is particularly relevant for species like BF\u2083 and AlCl\u2083, which lack a hydrogen ion to donate but can accept electron pairs. Phenol is a classic example of an organic acid, albeit a weaker one compared to carboxylic acids, with a pKa of around 10.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following compounds is NOT considered an acid ? [amp_mcq option1=”BF\u2083” option2=”AlCl\u2083” option3=”NH\u2083” option4=”C\u2086H\u2085OH” correct=”option3″] This question was previously asked in UPSC CAPF – 2015 Download PDFAttempt Online A) BF\u2083 (Boron Trifluoride) is a Lewis acid because the Boron atom has an incomplete octet and can accept an electron pair. B) AlCl\u2083 … <\/p>\n

Detailed SolutionWhich one of the following compounds is NOT considered an acid ?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1085],"tags":[1443,1202,1096],"class_list":["post-89944","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1443","tag-acid-base-and-salt","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one of the following compounds is NOT considered an acid ?<\/title>\n<meta name=\"description\" content=\"A) BF\u2083 (Boron Trifluoride) is a Lewis acid because the Boron atom has an incomplete octet and can accept an electron pair. B) AlCl\u2083 (Aluminum Chloride) is also a Lewis acid as the Aluminum atom has an incomplete octet and can accept an electron pair. C) NH\u2083 (Ammonia) is a Br\u00f8nsted-Lowry base because it can accept a proton (H\u207a) to form ammonium ion (NH\u2084\u207a). It is also a Lewis base because the nitrogen atom has a lone pair of electrons that it can donate. It is not considered an acid in standard definitions. D) C\u2086H\u2085OH (Phenol) is a weak acid because the hydroxyl group (-OH) attached to the benzene ring can donate a proton, forming the phenoxide ion. The acidity is enhanced by the stability of the phenoxide ion through resonance. Therefore, NH\u2083 is the compound that is NOT considered an acid; it is a base. Acids can be defined in various ways (Arrhenius, Br\u00f8nsted-Lowry, Lewis). Br\u00f8nsted-Lowry acids are proton donors. Lewis acids are electron pair acceptors. Bases are proton acceptors (Br\u00f8nsted-Lowry) or electron pair donors (Lewis). Ammonia is a common example of a base.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-not-considered-an-acid\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following compounds is NOT considered an acid ?\" \/>\n<meta property=\"og:description\" content=\"A) BF\u2083 (Boron Trifluoride) is a Lewis acid because the Boron atom has an incomplete octet and can accept an electron pair. B) AlCl\u2083 (Aluminum Chloride) is also a Lewis acid as the Aluminum atom has an incomplete octet and can accept an electron pair. C) NH\u2083 (Ammonia) is a Br\u00f8nsted-Lowry base because it can accept a proton (H\u207a) to form ammonium ion (NH\u2084\u207a). It is also a Lewis base because the nitrogen atom has a lone pair of electrons that it can donate. It is not considered an acid in standard definitions. D) C\u2086H\u2085OH (Phenol) is a weak acid because the hydroxyl group (-OH) attached to the benzene ring can donate a proton, forming the phenoxide ion. The acidity is enhanced by the stability of the phenoxide ion through resonance. Therefore, NH\u2083 is the compound that is NOT considered an acid; it is a base. Acids can be defined in various ways (Arrhenius, Br\u00f8nsted-Lowry, Lewis). Br\u00f8nsted-Lowry acids are proton donors. Lewis acids are electron pair acceptors. Bases are proton acceptors (Br\u00f8nsted-Lowry) or electron pair donors (Lewis). Ammonia is a common example of a base.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-not-considered-an-acid\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:17:42+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following compounds is NOT considered an acid ?","description":"A) BF\u2083 (Boron Trifluoride) is a Lewis acid because the Boron atom has an incomplete octet and can accept an electron pair. B) AlCl\u2083 (Aluminum Chloride) is also a Lewis acid as the Aluminum atom has an incomplete octet and can accept an electron pair. C) NH\u2083 (Ammonia) is a Br\u00f8nsted-Lowry base because it can accept a proton (H\u207a) to form ammonium ion (NH\u2084\u207a). It is also a Lewis base because the nitrogen atom has a lone pair of electrons that it can donate. It is not considered an acid in standard definitions. D) C\u2086H\u2085OH (Phenol) is a weak acid because the hydroxyl group (-OH) attached to the benzene ring can donate a proton, forming the phenoxide ion. The acidity is enhanced by the stability of the phenoxide ion through resonance. Therefore, NH\u2083 is the compound that is NOT considered an acid; it is a base. Acids can be defined in various ways (Arrhenius, Br\u00f8nsted-Lowry, Lewis). Br\u00f8nsted-Lowry acids are proton donors. Lewis acids are electron pair acceptors. Bases are proton acceptors (Br\u00f8nsted-Lowry) or electron pair donors (Lewis). Ammonia is a common example of a base.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-not-considered-an-acid\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following compounds is NOT considered an acid ?","og_description":"A) BF\u2083 (Boron Trifluoride) is a Lewis acid because the Boron atom has an incomplete octet and can accept an electron pair. B) AlCl\u2083 (Aluminum Chloride) is also a Lewis acid as the Aluminum atom has an incomplete octet and can accept an electron pair. C) NH\u2083 (Ammonia) is a Br\u00f8nsted-Lowry base because it can accept a proton (H\u207a) to form ammonium ion (NH\u2084\u207a). It is also a Lewis base because the nitrogen atom has a lone pair of electrons that it can donate. It is not considered an acid in standard definitions. D) C\u2086H\u2085OH (Phenol) is a weak acid because the hydroxyl group (-OH) attached to the benzene ring can donate a proton, forming the phenoxide ion. The acidity is enhanced by the stability of the phenoxide ion through resonance. Therefore, NH\u2083 is the compound that is NOT considered an acid; it is a base. Acids can be defined in various ways (Arrhenius, Br\u00f8nsted-Lowry, Lewis). Br\u00f8nsted-Lowry acids are proton donors. Lewis acids are electron pair acceptors. Bases are proton acceptors (Br\u00f8nsted-Lowry) or electron pair donors (Lewis). Ammonia is a common example of a base.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-not-considered-an-acid\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:17:42+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-not-considered-an-acid\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-not-considered-an-acid\/","name":"Which one of the following compounds is NOT considered an acid ?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:17:42+00:00","dateModified":"2025-06-01T10:17:42+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"A) BF\u2083 (Boron Trifluoride) is a Lewis acid because the Boron atom has an incomplete octet and can accept an electron pair. 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