{"id":87048,"date":"2025-06-01T04:27:03","date_gmt":"2025-06-01T04:27:03","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87048"},"modified":"2025-06-01T04:27:03","modified_gmt":"2025-06-01T04:27:03","slug":"which-one-of-the-following-compounds-is-used-for-the-synthesis-of","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-used-for-the-synthesis-of\/","title":{"rendered":"Which one of the following compounds is used for the synthesis of"},"content":{"rendered":"

Which one of the following compounds is used for the synthesis of silicones?<\/p>\n

[amp_mcq option1=”SiCl\u2084” option2=”(CH\u2083)\u2082Si(OH)\u2082” option3=”SiO\u2082” option4=”Na\u2084SiO\u2084” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC Geoscientist – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is (CH\u2083)\u2082Si(OH)\u2082.
\n<\/section>\n
\nSilicones are polymeric organosilicon compounds. They are typically synthesized by the hydrolysis of alkyl or aryl substituted chlorosilanes, such as R\u2082SiCl\u2082. The hydrolysis of (CH\u2083)\u2082SiCl\u2082 yields (CH\u2083)\u2082Si(OH)\u2082, which is a silanol. These silanol monomers then undergo condensation polymerization by eliminating water molecules between hydroxyl groups, forming Si-O-Si linkages, which constitute the backbone of silicones.
\n<\/section>\n
\nWhile chlorosilanes like R\u2082SiCl\u2082 are the starting materials for the synthesis of linear silicones, the hydrolysis product, R\u2082Si(OH)\u2082, is the intermediate that directly undergoes polymerization. SiCl\u2084 can be used to produce branched or cross-linked silicones (by yielding Si(OH)\u2084 upon hydrolysis, which can polymerize in multiple directions), but the simple linear silicones often start from dialkyl dichlorosilanes and their hydrolysis products. SiO\u2082 (silica) is a natural inorganic compound, not used as a direct monomer for common silicones synthesis. Na\u2084SiO\u2084 is sodium orthosilicate, which is a silicate salt, also not a typical monomer for silicone synthesis.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following compounds is used for the synthesis of silicones? [amp_mcq option1=”SiCl\u2084” option2=”(CH\u2083)\u2082Si(OH)\u2082” option3=”SiO\u2082” option4=”Na\u2084SiO\u2084” correct=”option2″] This question was previously asked in UPSC Geoscientist – 2023 Download PDFAttempt Online The correct answer is (CH\u2083)\u2082Si(OH)\u2082. Silicones are polymeric organosilicon compounds. They are typically synthesized by the hydrolysis of alkyl or aryl substituted chlorosilanes, … <\/p>\n

Detailed SolutionWhich one of the following compounds is used for the synthesis of<\/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":[1091],"tags":[1105,1096,1097],"class_list":["post-87048","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1105","tag-chemistry","tag-polymer","no-featured-image-padding"],"yoast_head":"\nWhich one of the following compounds is used for the synthesis of<\/title>\n<meta name=\"description\" content=\"The correct answer is (CH\u2083)\u2082Si(OH)\u2082. Silicones are polymeric organosilicon compounds. They are typically synthesized by the hydrolysis of alkyl or aryl substituted chlorosilanes, such as R\u2082SiCl\u2082. The hydrolysis of (CH\u2083)\u2082SiCl\u2082 yields (CH\u2083)\u2082Si(OH)\u2082, which is a silanol. These silanol monomers then undergo condensation polymerization by eliminating water molecules between hydroxyl groups, forming Si-O-Si linkages, which constitute the backbone of silicones.\" \/>\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-used-for-the-synthesis-of\/\" \/>\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 used for the synthesis of\" \/>\n<meta property=\"og:description\" content=\"The correct answer is (CH\u2083)\u2082Si(OH)\u2082. Silicones are polymeric organosilicon compounds. They are typically synthesized by the hydrolysis of alkyl or aryl substituted chlorosilanes, such as R\u2082SiCl\u2082. The hydrolysis of (CH\u2083)\u2082SiCl\u2082 yields (CH\u2083)\u2082Si(OH)\u2082, which is a silanol. These silanol monomers then undergo condensation polymerization by eliminating water molecules between hydroxyl groups, forming Si-O-Si linkages, which constitute the backbone of silicones.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-is-used-for-the-synthesis-of\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:27:03+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 used for the synthesis of","description":"The correct answer is (CH\u2083)\u2082Si(OH)\u2082. 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They are typically synthesized by the hydrolysis of alkyl or aryl substituted chlorosilanes, such as R\u2082SiCl\u2082. The hydrolysis of (CH\u2083)\u2082SiCl\u2082 yields (CH\u2083)\u2082Si(OH)\u2082, which is a silanol. 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Silicones are polymeric organosilicon compounds. They are typically synthesized by the hydrolysis of alkyl or aryl substituted chlorosilanes, such as R\u2082SiCl\u2082. The hydrolysis of (CH\u2083)\u2082SiCl\u2082 yields (CH\u2083)\u2082Si(OH)\u2082, which is a silanol. 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