{"id":88877,"date":"2025-06-01T07:24:01","date_gmt":"2025-06-01T07:24:01","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88877"},"modified":"2025-06-01T07:24:01","modified_gmt":"2025-06-01T07:24:01","slug":"the-number-of-structural-isomers-of-pentane-is","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-number-of-structural-isomers-of-pentane-is\/","title":{"rendered":"The number of structural isomers of pentane is"},"content":{"rendered":"

The number of structural isomers of pentane is<\/p>\n

[amp_mcq option1=”5″ option2=”4″ option3=”2″ option4=”3″ correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2022<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is 3.
\n<\/section>\n
\nStructural isomers are compounds with the same molecular formula but different arrangements of atoms. Pentane has the molecular formula C\u2085H\u2081\u2082. The three structural isomers of pentane are:
\n1. n-pentane (a straight chain of five carbon atoms).
\n2. Isopentane (2-methylbutane, a four-carbon chain with a methyl group attached to the second carbon).
\n3. Neopentane (2,2-dimethylpropane, a three-carbon chain with two methyl groups attached to the central carbon).
\n<\/section>\n
\nAs the number of carbon atoms increases in alkanes, the number of possible structural isomers grows rapidly. For example, hexane (C\u2086H\u2081\u2084) has 5 isomers, and heptane (C\u2087H\u2081\u2086) has 9 isomers.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The number of structural isomers of pentane is [amp_mcq option1=”5″ option2=”4″ option3=”2″ option4=”3″ correct=”option4″] This question was previously asked in UPSC NDA-2 – 2022 Download PDFAttempt Online The correct answer is 3. Structural isomers are compounds with the same molecular formula but different arrangements of atoms. Pentane has the molecular formula C\u2085H\u2081\u2082. The three structural … <\/p>\n

Detailed SolutionThe number of structural isomers of pentane is<\/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":[1094],"tags":[1108,1096,1330],"class_list":["post-88877","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1108","tag-chemistry","tag-hydrocarbons","no-featured-image-padding"],"yoast_head":"\nThe number of structural isomers of pentane is<\/title>\n<meta name=\"description\" content=\"The correct answer is 3. Structural isomers are compounds with the same molecular formula but different arrangements of atoms. Pentane has the molecular formula C\u2085H\u2081\u2082. The three structural isomers of pentane are: 1. n-pentane (a straight chain of five carbon atoms). 2. Isopentane (2-methylbutane, a four-carbon chain with a methyl group attached to the second carbon). 3. Neopentane (2,2-dimethylpropane, a three-carbon chain with two methyl groups attached to the central carbon).\" \/>\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\/the-number-of-structural-isomers-of-pentane-is\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The number of structural isomers of pentane is\" \/>\n<meta property=\"og:description\" content=\"The correct answer is 3. Structural isomers are compounds with the same molecular formula but different arrangements of atoms. Pentane has the molecular formula C\u2085H\u2081\u2082. The three structural isomers of pentane are: 1. n-pentane (a straight chain of five carbon atoms). 2. Isopentane (2-methylbutane, a four-carbon chain with a methyl group attached to the second carbon). 3. 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Structural isomers are compounds with the same molecular formula but different arrangements of atoms. Pentane has the molecular formula C\u2085H\u2081\u2082. The three structural isomers of pentane are: 1. n-pentane (a straight chain of five carbon atoms). 2. Isopentane (2-methylbutane, a four-carbon chain with a methyl group attached to the second carbon). 3. Neopentane (2,2-dimethylpropane, a three-carbon chain with two methyl groups attached to the central carbon).","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\/the-number-of-structural-isomers-of-pentane-is\/","og_locale":"en_US","og_type":"article","og_title":"The number of structural isomers of pentane is","og_description":"The correct answer is 3. Structural isomers are compounds with the same molecular formula but different arrangements of atoms. Pentane has the molecular formula C\u2085H\u2081\u2082. The three structural isomers of pentane are: 1. n-pentane (a straight chain of five carbon atoms). 2. Isopentane (2-methylbutane, a four-carbon chain with a methyl group attached to the second carbon). 3. Neopentane (2,2-dimethylpropane, a three-carbon chain with two methyl groups attached to the central carbon).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-number-of-structural-isomers-of-pentane-is\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:24:01+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\/the-number-of-structural-isomers-of-pentane-is\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-number-of-structural-isomers-of-pentane-is\/","name":"The number of structural isomers of pentane is","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:24:01+00:00","dateModified":"2025-06-01T07:24:01+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct answer is 3. Structural isomers are compounds with the same molecular formula but different arrangements of atoms. Pentane has the molecular formula C\u2085H\u2081\u2082. The three structural isomers of pentane are: 1. n-pentane (a straight chain of five carbon atoms). 2. Isopentane (2-methylbutane, a four-carbon chain with a methyl group attached to the second carbon). 3. Neopentane (2,2-dimethylpropane, a three-carbon chain with two methyl groups attached to the central carbon).","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-number-of-structural-isomers-of-pentane-is\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-number-of-structural-isomers-of-pentane-is\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-number-of-structural-isomers-of-pentane-is\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-2","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-2\/"},{"@type":"ListItem","position":3,"name":"The number of structural isomers of pentane is"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=88877"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88877\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=88877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=88877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=88877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}